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b in (-oo:+oo)
5*b-10 = 35-4*b // - 35-4*b
5*b-(-4*b)-35-10 = 0
5*b+4*b-35-10 = 0
9*b-45 = 0 // + 45
9*b = 45 // : 9
b = 45/9
b = 5
b = 5
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