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x in (-oo:+oo)
x/(-8) = 12-2 // - 12-2
x/(-8)-12+2 = 0
-1/8*x-10 = 0 // + 10
-1/8*x = 10 // : -1/8
x = 10/(-1/8)
x = -80
x = -80
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