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b in (-oo:+oo)
3*b+8 = 58-7*b // - 58-7*b
3*b-(-7*b)-58+8 = 0
3*b+7*b-58+8 = 0
10*b-50 = 0 // + 50
10*b = 50 // : 10
b = 50/10
b = 5
b = 5
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