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