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b in (-oo:+oo)
(-3/7)*b-(7/10) = (-5/6)*b-(317/210) // - (-5/6)*b-(317/210)
(-3/7)*b-((-5/6)*b)-(7/10)+317/210 = 0
(-3/7)*b+(5/6)*b-7/10+317/210 = 0
17/42*b+17/21 = 0 // - 17/21
17/42*b = -17/21 // : 17/42
b = -17/21/17/42
b = -2
b = -2
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