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b in (-oo:+oo)
6/7-(7*b) = -37/14 // + -37/14
6/7-(7*b)-(-37/14) = 0
6/7-7*b+37/14 = 0
7/2-7*b = 0 // - 7/2
-7*b = -7/2 // : -7
b = -7/2/(-7)
b = 1/2
b = 1/2
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