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x in (-oo:+oo)
x+4 = 4*x-11 // - 4*x-11
x-(4*x)+4+11 = 0
x-4*x+4+11 = 0
15-3*x = 0 // - 15
-3*x = -15 // : -3
x = -15/(-3)
x = 5
x = 5
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