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b in (-oo:+oo)
7*(6-(4*b)) = -154 // + 154
7*(6-(4*b))+154 = 0
7*(6-4*b)+154 = 0
7*(6-4*b)+154 = 0
196-28*b = 0
196-28*b = 0
196-28*b = 0 // - 196
-28*b = -196 // : -28
b = -196/(-28)
b = 7
b = 7
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