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b in (-oo:+oo)
6*(5-(7*b)) = 156 // - 156
6*(5-(7*b))-156 = 0
6*(5-7*b)-156 = 0
6*(5-7*b)-156 = 0
-42*b-126 = 0
-42*b-126 = 0
-42*b-126 = 0 // + 126
-42*b = 126 // : -42
b = 126/(-42)
b = -3
b = -3
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