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x in (-oo:+oo)
-68 = 5*x+x-8 // - 5*x+x-8
8-(5*x)-x-68 = 0
8-5*x-x-68 = 0
-6*x-60 = 0 // + 60
-6*x = 60 // : -6
x = 60/(-6)
x = -10
x = -10
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