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