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b in (-oo:+oo)
(2/7)*b-((1/3)*b)+4/5 = 716/945 // - 716/945
(2/7)*b-((1/3)*b)+4/5-(716/945) = 0
(2/7)*b+(-1/3)*b+4/5-716/945 = 0
8/189-1/21*b = 0 // - 8/189
-1/21*b = -8/189 // : -1/21
b = -8/189/(-1/21)
b = 8/9
b = 8/9
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