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