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a in (-oo:+oo)
5-(7*a) = 2*a+68 // - 2*a+68
5-(7*a)-(2*a)-68 = 0
5-7*a-2*a-68 = 0
-9*a-63 = 0 // + 63
-9*a = 63 // : -9
a = 63/(-9)
a = -7
a = -7
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