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x in (-oo:+oo)
-107 = 5*x+4*x-8 // - 5*x+4*x-8
8-(5*x)-(4*x)-107 = 0
8-5*x-4*x-107 = 0
-9*x-99 = 0 // + 99
-9*x = 99 // : -9
x = 99/(-9)
x = -11
x = -11
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