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b in (-oo:+oo)
(-2/3)*b-((3/7)*b)-(6/7) = -29/7 // + -29/7
(-2/3)*b-((3/7)*b)-(6/7)-(-29/7) = 0
(-2/3)*b+(-3/7)*b-6/7+29/7 = 0
23/7-23/21*b = 0 // - 23/7
-23/21*b = -23/7 // : -23/21
b = -23/7/(-23/21)
b = 3
b = 3
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