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b in (-oo:+oo)
222/49 = (6/7)*b-3*b+3 // - (6/7)*b-3*b+3
222/49-(-3*b)-((6/7)*b)-3 = 0
3*b+(-6/7)*b+222/49-3 = 0
15/7*b+75/49 = 0 // - 75/49
15/7*b = -75/49 // : 15/7
b = -75/49/15/7
b = -5/7
b = -5/7
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