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b in (-oo:+oo)
4*(7*b+6) = 276 // - 276
4*(7*b+6)-276 = 0
4*(7*b+6)-276 = 0
28*b-252 = 0
28*b-252 = 0
28*b-252 = 0 // + 252
28*b = 252 // : 28
b = 252/28
b = 9
b = 9
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