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b in (-oo:+oo)
b/5+1/7 = 19 // - 19
b/5+1/7-19 = 0
1/5*b-132/7 = 0 // + 132/7
1/5*b = 132/7 // : 1/5
b = 132/7/1/5
b = 660/7
b = 660/7
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