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b in (-oo:+oo)
374/9 = 5*b+(6/7)*b+5/9 // - 5*b+(6/7)*b+5/9
374/9-(5*b)-((6/7)*b)-(5/9) = 0
(-6/7)*b-5*b+374/9-5/9 = 0
41-41/7*b = 0 // - 41
-41/7*b = -41 // : -41/7
b = -41/(-41/7)
b = 7
b = 7
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