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b in (-oo:+oo)
7*b-3*b+1 = 41/9 // - 41/9
7*b-3*b-(41/9)+1 = 0
7*b-3*b-41/9+1 = 0
4*b-32/9 = 0 // + 32/9
4*b = 32/9 // : 4
b = 32/9/4
b = 8/9
b = 8/9
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