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b in (-oo:+oo)
(-2/7)*b = 4/63 // - 4/63
(-2/7)*b-(4/63) = 0
(-2/7)*b-4/63 = 0
-2/7*b-4/63 = 0 // + 4/63
-2/7*b = 4/63 // : -2/7
b = 4/63/(-2/7)
b = -2/9
b = -2/9
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