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x in (-oo:+oo)
-x-7 = 6*x+49 // - 6*x+49
-x-(6*x)-49-7 = 0
-x-6*x-49-7 = 0
-7*x-56 = 0 // + 56
-7*x = 56 // : -7
x = 56/(-7)
x = -8
x = -8
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