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a in (-oo:+oo)
7 = 7*a-6*a+10 // - 7*a-6*a+10
7-(-6*a)-(7*a)-10 = 0
6*a-7*a-10+7 = 0
-a-3 = 0 // + 3
-a = 3 // * -1
a = -3
a = -3
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