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b in (-oo:+oo)
2*(5*b+1) = 32 // - 32
2*(5*b+1)-32 = 0
2*(5*b+1)-32 = 0
10*b-30 = 0
10*b-30 = 0
10*b-30 = 0 // + 30
10*b = 30 // : 10
b = 30/10
b = 3
b = 3
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