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b in (-oo:+oo)
b-(10/7) = b/4 // - b/4
b-(b/4)-(10/7) = 0
b-(b/4)-10/7 = 0
3/4*b-10/7 = 0 // + 10/7
3/4*b = 10/7 // : 3/4
b = 10/7/3/4
b = 40/21
b = 40/21
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