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a in (-oo:+oo)
5*a-(2*a)+2 = 11 // - 11
5*a-(2*a)-11+2 = 0
5*a-2*a-11+2 = 0
3*a-9 = 0 // + 9
3*a = 9 // : 3
a = 9/3
a = 3
a = 3
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