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