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b in (-oo:+oo)
7*b-3 = 87-3*b // - 87-3*b
7*b-(-3*b)-87-3 = 0
7*b+3*b-87-3 = 0
10*b-90 = 0 // + 90
10*b = 90 // : 10
b = 90/10
b = 9
b = 9
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