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(2*y)/5-((3*x)/4) = 1/2 / - 1/2

(2*y)/5-((3*x)/4)-(1/2) = 0

(-3/4)*x+(2*y)/5-1/2 = 0

2/5*y-3/4*x-1/2 = 0 / - 2/5*y-1/2

-3/4*x = -(2/5*y-1/2) / : -3/4

x = (-(2/5*y-1/2))/(-3/4)

x = -4/3*(1/2-(2/5*y))

x = -4/3*(1/2-(2/5*y))

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