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b in (-oo:+oo)
2.5 = b/7 // - b/7
2.5-(b/7) = 0
2.5-1/7*b = 0 // - 2.5
-1/7*b = -2.5 // : -1/7
b = -2.5/(-1/7)
b = 17.50000035
b = 17.50000035
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