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x in (-oo:+oo)
-4*x-9 = 7*x+79 // - 7*x+79
-4*x-(7*x)-79-9 = 0
-4*x-7*x-79-9 = 0
-11*x-88 = 0 // + 88
-11*x = 88 // : -11
x = 88/(-11)
x = -8
x = -8
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