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x in (-oo:+oo)
7*x-(2*x)-2 = 53 // - 53
7*x-(2*x)-53-2 = 0
7*x-2*x-53-2 = 0
5*x-55 = 0 // + 55
5*x = 55 // : 5
x = 55/5
x = 11
x = 11
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