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3x+4=-2(x-9)

We move all terms to the left:

3x+4-(-2(x-9))=0

We calculate terms in parentheses: -(-2(x-9)), so:We get rid of parentheses

-2(x-9)

We multiply parentheses

-2x+18

Back to the equation:

-(-2x+18)

3x+2x-18+4=0

We add all the numbers together, and all the variables

5x-14=0

We move all terms containing x to the left, all other terms to the right

5x=14

x=14/5

x=2+4/5

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