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a in (-oo:+oo)
10-7*a = 6*a+88 // - 6*a+88
10-7*a-(6*a)-88 = 0
10-7*a-6*a-88 = 0
-13*a-78 = 0 // + 78
-13*a = 78 // : -13
a = 78/(-13)
a = -6
a = -6
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