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b in (-oo:+oo)
4/7 = b/35 // - b/35
4/7-(b/35) = 0
4/7-1/35*b = 0 // - 4/7
-1/35*b = -4/7 // : -1/35
b = -4/7/(-1/35)
b = 20
b = 20
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