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a in (-oo:+oo)
5*(6-(7*a)) = -180 // + 180
5*(6-(7*a))+180 = 0
5*(6-7*a)+180 = 0
5*(6-7*a)+180 = 0
210-35*a = 0
210-35*a = 0
210-35*a = 0 // - 210
-35*a = -210 // : -35
a = -210/(-35)
a = 6
a = 6
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