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b in (-oo:+oo)
6*(7*b+3) = 270 // - 270
6*(7*b+3)-270 = 0
6*(7*b+3)-270 = 0
42*b-252 = 0
42*b-252 = 0
42*b-252 = 0 // + 252
42*b = 252 // : 42
b = 252/42
b = 6
b = 6
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