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x in (-oo:+oo)
y = (1/2)*(4*x+8)-3 // - (1/2)*(4*x+8)-3
y-((1/2)*(4*x+8))+3 = 0
(-1/2)*(4*x+8)+y+3 = 0
y-1/2*(4*x+8)+3 = 0
y-1/2*(4*x+8)+3 = 0
y-2*x-4+3 = 0
y-2*x-1 = 0
y-2*x-1 = 0
y-2*x-1 = 0 // - y-1
-2*x = -(y-1) // : -2
x = (-(y-1))/(-2)
x = (1-y)/(-2)
x = (1-y)/(-2)
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