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x in (-oo:+oo)
-(4*x)-7 = 5*x-115 // - 5*x-115
115-(4*x)-(5*x)-7 = 0
115-4*x-5*x-7 = 0
108-9*x = 0 // - 108
-9*x = -108 // : -9
x = -108/(-9)
x = 12
x = 12
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