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b in (-oo:+oo)
(4/7)*b = 16/7 // - 16/7
(4/7)*b-(16/7) = 0
(4/7)*b-16/7 = 0
4/7*b-16/7 = 0 // + 16/7
4/7*b = 16/7 // : 4/7
b = 16/7/4/7
b = 4
b = 4
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