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b in (-oo:+oo)
5*(4*b+10) = 190 // - 190
5*(4*b+10)-190 = 0
5*(4*b+10)-190 = 0
20*b-140 = 0
20*b-140 = 0
20*b-140 = 0 // + 140
20*b = 140 // : 20
b = 140/20
b = 7
b = 7
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