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b in (-oo:+oo)
3*b+1/4 = 121/4 // - 121/4
3*b+1/4-(121/4) = 0
3*b+1/4-121/4 = 0
3*b-30 = 0 // + 30
3*b = 30 // : 3
b = 30/3
b = 10
b = 10
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