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b in (-oo:+oo)
-((2/7)*b)-5 = -377/77 // + -377/77
-((2/7)*b)-(-377/77)-5 = 0
(-2/7)*b+377/77-5 = 0
-2/7*b-8/77 = 0 // + 8/77
-2/7*b = 8/77 // : -2/7
b = 8/77/(-2/7)
b = -4/11
b = -4/11
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