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b in (-oo:+oo)
420 = (7/6)*b // - (7/6)*b
420-((7/6)*b) = 0
(-7/6)*b+420 = 0
420-7/6*b = 0 // - 420
-7/6*b = -420 // : -7/6
b = -420/(-7/6)
b = 360
b = 360
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