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