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x in (-oo:+oo)
4*(8-x) = -4 // + 4
4*(8-x)+4 = 0
4*(8-x)+4 = 0
36-4*x = 0
36-4*x = 0
36-4*x = 0 // - 36
-4*x = -36 // : -4
x = -36/(-4)
x = 9
x = 9
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