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b in (-oo:+oo)
6-5*b-(7*b) = 78 // - 78
6-5*b-(7*b)-78 = 0
6-5*b-7*b-78 = 0
-12*b-72 = 0 // + 72
-12*b = 72 // : -12
b = 72/(-12)
b = -6
b = -6
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