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b in (-oo:+oo)
7*b-4 = (4/7)*b+422/7 // - (4/7)*b+422/7
7*b-((4/7)*b)-(422/7)-4 = 0
7*b+(-4/7)*b-422/7-4 = 0
45/7*b-450/7 = 0 // + 450/7
45/7*b = 450/7 // : 45/7
b = 450/7/45/7
b = 10
b = 10
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