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b in (-oo:+oo)
2*(7*b+1) = 100 // - 100
2*(7*b+1)-100 = 0
2*(7*b+1)-100 = 0
14*b-98 = 0
14*b-98 = 0
14*b-98 = 0 // + 98
14*b = 98 // : 14
b = 98/14
b = 7
b = 7
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