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b in (-oo:+oo)
-5*b-(6/7) = (1/3)*b-74/21 // - (1/3)*b-74/21
-5*b-((1/3)*b)-(6/7)-(-74/21) = 0
(-1/3)*b-5*b-6/7+74/21 = 0
8/3-16/3*b = 0 // - 8/3
-16/3*b = -8/3 // : -16/3
b = -8/3/(-16/3)
b = 1/2
b = 1/2
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