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x in (-oo:+oo)
-11 = 4*x-x+7 // - 4*x-x+7
x-(4*x)-11-7 = 0
x-4*x-11-7 = 0
-3*x-18 = 0 // + 18
-3*x = 18 // : -3
x = 18/(-3)
x = -6
x = -6
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