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