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x in (-oo:+oo)
(3/4)*x-((1/2)*y) = 8 // - 8
(3/4)*x-((1/2)*y)-8 = 0
(3/4)*x+(-1/2)*y-8 = 0
3/4*x-1/2*y-8 = 0 // + -1/2*y-8
3/4*x = -(-1/2*y-8) // : 3/4
x = (-(-1/2*y-8))/3/4
x = 4/3*(8-(-1/2*y))
x = 4/3*(8-(-1/2*y))
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