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