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