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4*x+12 = (5/2)*y // - (5/2)*y
4*x-((5/2)*y)+12 = 0
4*x+(-5/2)*y+12 = 0
4*x-5/2*y+12 = 0 // - 12-5/2*y
4*x = -(12-5/2*y) // : 4
x = (-(12-5/2*y))/4
x = (-(12-5/2*y))/4
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