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x in (-oo:+oo)
-3*x-(7*x)-5 = -115 // + 115
115-3*x-(7*x)-5 = 0
115-3*x-7*x-5 = 0
110-10*x = 0 // - 110
-10*x = -110 // : -10
x = -110/(-10)
x = 11
x = 11
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