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a in (-oo:+oo)
5*(4-(7*a)) = -295 // + 295
5*(4-(7*a))+295 = 0
5*(4-7*a)+295 = 0
5*(4-7*a)+295 = 0
315-35*a = 0
315-35*a = 0
315-35*a = 0 // - 315
-35*a = -315 // : -35
a = -315/(-35)
a = 9
a = 9
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