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