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