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b in (-oo:+oo)
b/7+1/4 = 19 // - 19
b/7+1/4-19 = 0
1/7*b-75/4 = 0 // + 75/4
1/7*b = 75/4 // : 1/7
b = 75/4/1/7
b = 525/4
b = 525/4
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