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b in (-oo:+oo)
392 = (7/10)*b // - (7/10)*b
392-((7/10)*b) = 0
(-7/10)*b+392 = 0
392-7/10*b = 0 // - 392
-7/10*b = -392 // : -7/10
b = -392/(-7/10)
b = 560
b = 560
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