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a in (-oo:+oo)
118 = 7*a+2*a+10 // - 7*a+2*a+10
118-(7*a)-(2*a)-10 = 0
118-7*a-2*a-10 = 0
108-9*a = 0 // - 108
-9*a = -108 // : -9
a = -108/(-9)
a = 12
a = 12
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