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x in (-oo:+oo)
7*x-5 = 5*x+11 // - 5*x+11
7*x-(5*x)-11-5 = 0
7*x-5*x-11-5 = 0
2*x-16 = 0 // + 16
2*x = 16 // : 2
x = 16/2
x = 8
x = 8
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