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x in (-oo:+oo)
2*x-((3/4)*y) = 12 // - 12
2*x-((3/4)*y)-12 = 0
2*x+(-3/4)*y-12 = 0
2*x-3/4*y-12 = 0 // + -3/4*y-12
2*x = -(-3/4*y-12) // : 2
x = (-(-3/4*y-12))/2
x = (12-(-3/4*y))/2
x = (12-(-3/4*y))/2
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