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b in (-oo:+oo)
1.47 = b/7 // - b/7
1.47-(b/7) = 0
1.47-1/7*b = 0 // - 1.47
-1/7*b = -1.47 // : -1/7
b = -1.47/(-1/7)
b = 10.29000021
b = 10.29000021
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