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a in (-oo:+oo)
5*(6-(7*a)) = -355 // + 355
5*(6-(7*a))+355 = 0
5*(6-7*a)+355 = 0
5*(6-7*a)+355 = 0
385-35*a = 0
385-35*a = 0
385-35*a = 0 // - 385
-35*a = -385 // : -35
a = -385/(-35)
a = 11
a = 11
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