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b in (-oo:+oo)
(-4/7)*b+10 = 598/63 // - 598/63
(-4/7)*b-(598/63)+10 = 0
(-4/7)*b-598/63+10 = 0
32/63-4/7*b = 0 // - 32/63
-4/7*b = -32/63 // : -4/7
b = -32/63/(-4/7)
b = 8/9
b = 8/9
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