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x in (-oo:+oo)
-5*x-5 = 2*x-89 // - 2*x-89
89-5*x-(2*x)-5 = 0
89-5*x-2*x-5 = 0
84-7*x = 0 // - 84
-7*x = -84 // : -7
x = -84/(-7)
x = 12
x = 12
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