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a in (-oo:+oo)
a-(7*a)-10 = 2 // - 2
a-(7*a)-10-2 = 0
a-7*a-10-2 = 0
-6*a-12 = 0 // + 12
-6*a = 12 // : -6
a = 12/(-6)
a = -2
a = -2
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