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a in (-oo:+oo)
5*a+10 = 82-7*a // - 82-7*a
5*a-(-7*a)-82+10 = 0
5*a+7*a-82+10 = 0
12*a-72 = 0 // + 72
12*a = 72 // : 12
a = 72/12
a = 6
a = 6
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