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b in (-oo:+oo)
3/4-((4/7)*b) = 117/28 // - 117/28
3/4-((4/7)*b)-(117/28) = 0
(-4/7)*b+3/4-117/28 = 0
-4/7*b-24/7 = 0 // + 24/7
-4/7*b = 24/7 // : -4/7
b = 24/7/(-4/7)
b = -6
b = -6
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