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b in (-oo:+oo)
b+b/5-10 = 42/5 // - 42/5
b+b/5-(42/5)-10 = 0
b+b/5-42/5-10 = 0
6/5*b-92/5 = 0 // + 92/5
6/5*b = 92/5 // : 6/5
b = 92/5/6/5
b = 46/3
b = 46/3
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