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x in (-oo:+oo)
3*x-((1/2)*y) = 9 // - 9
3*x-((1/2)*y)-9 = 0
3*x+(-1/2)*y-9 = 0
3*x-1/2*y-9 = 0 // + -1/2*y-9
3*x = -(-1/2*y-9) // : 3
x = (-(-1/2*y-9))/3
x = (9-(-1/2*y))/3
x = (9-(-1/2*y))/3
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