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