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b in (-oo:+oo)
3*b+(3/7)*b+6 = 330/7 // - 330/7
3*b+(3/7)*b-(330/7)+6 = 0
3*b+(3/7)*b-330/7+6 = 0
24/7*b-288/7 = 0 // + 288/7
24/7*b = 288/7 // : 24/7
b = 288/7/24/7
b = 12
b = 12
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