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b in (-oo:+oo)
79/7 = (4/5)*b+(3/7)*b-1 // - (4/5)*b+(3/7)*b-1
79/7-((4/5)*b)-((3/7)*b)+1 = 0
(-4/5)*b+(-3/7)*b+79/7+1 = 0
86/7-43/35*b = 0 // - 86/7
-43/35*b = -86/7 // : -43/35
b = -86/7/(-43/35)
b = 10
b = 10
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