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Simplifying 5 + -3k + 7 + -9k = 0 Reorder the terms: 5 + 7 + -3k + -9k = 0 Combine like terms: 5 + 7 = 12 12 + -3k + -9k = 0 Combine like terms: -3k + -9k = -12k 12 + -12k = 0 Solving 12 + -12k = 0 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -12k = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -12k = 0 + -12 -12k = 0 + -12 Combine like terms: 0 + -12 = -12 -12k = -12 Divide each side by '-12'. k = 1 Simplifying k = 1

| -n^2+12n-63=-4n^2 | | 5r(r-8)=0 | | 49-2=3a-10a | | -4+5y=-14 | | 13x^2-7100x=420000 | | -5-4y=3 | | 13x^2-2900x=210000 | | G+4h=180 | | 4+2(x+10)=50 | | -22=8y+6(y+8) | | 4x^2=-25+20x | | 8-58=-3(-3m)-8(2m)+2m | | -6x+4(x-8)=-20 | | (3+v)(5v+9)=0 | | 55=0.2(285-10e) | | (3.08+x)=3.5 | | 5r^2+7r-5=12 | | 4x+x+10=100 | | (x)=9/x-7 | | 2y/5-3x/4=1/2 | | X^2+34x+156=0 | | 19=5(v+5)-2v | | (x-4y)(4x+3)= | | D=26t^2 | | y=(x+1)(x+4) | | -2x^2+40x-202=0 | | 2x^3-8x^2+30x+16=0 | | 285=0.2(55-10e) | | 12c^2-12d^2=c^2-2cd+d^2 | | 1/2x-10=3/4 | | 3(x^4)=27 | | 3x(x^4)=27 | | (5/8)/(3/14) | | 0.05+0.2x=1.95 | | 0.4x+0.9y=3.6 | | -16=4(x-6)-8x | | 16u^6-10u^4/2u^3 | | 18m-(16mn+14n)= | | (5/8)÷(3/14) | | 2/5c=11 | | -2.5(0)-64=y | | 0/-2cd | | cos(40)=33/x | | v^2+12v-42=3 | | 0-6.1y-4.8=0 | | (Y-k)h=c | | 9.9x-0-4.8=0 | | 9.9x-6.1y-4.8=0 | | 149000=(1/X) | | 1/4v-7/8=-3/2 | | 0=-1w^2+10w | | 5(2x-1)=6(2x+5) | | 12d+15=7d | | -20c+8c= | | (7x^4+7x^3-9)-(9x^2-8x+8)= | | -8r+2q= | | y=cot(x^2-3x+5) | | 2(k+2)-8k+6+3= | | *5/4 | | (n+2)=132n | | -5-6y=1 | | (3X+7)(5X-3)=0 | | t(4t+5)(4t-5)=0 | | X+Y+(X+9)=30 | | -3(3y-6)+2(2y+8)= |

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