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a in (-oo:+oo)
5*a+10 = 106-7*a // - 106-7*a
5*a-(-7*a)-106+10 = 0
5*a+7*a-106+10 = 0
12*a-96 = 0 // + 96
12*a = 96 // : 12
a = 96/12
a = 8
a = 8
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