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a in (-oo:+oo)
5*a-10 = 7*a+8 // - 7*a+8
5*a-(7*a)-10-8 = 0
5*a-7*a-10-8 = 0
-2*a-18 = 0 // + 18
-2*a = 18 // : -2
a = 18/(-2)
a = -9
a = -9
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