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2*x-((3/4)*y) = -15 // + 15
2*x-((3/4)*y)+15 = 0
2*x+(-3/4)*y+15 = 0
2*x-3/4*y+15 = 0 // - 15-3/4*y
2*x = -(15-3/4*y) // : 2
x = (-(15-3/4*y))/2
x = (-(15-3/4*y))/2
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