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