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b in (-oo:+oo)
6*(7*b+3) = 228 // - 228
6*(7*b+3)-228 = 0
6*(7*b+3)-228 = 0
42*b-210 = 0
42*b-210 = 0
42*b-210 = 0 // + 210
42*b = 210 // : 42
b = 210/42
b = 5
b = 5
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