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b in (-oo:+oo)
-15 = (3/7)*b // - (3/7)*b
-((3/7)*b)-15 = 0
(-3/7)*b-15 = 0
-3/7*b-15 = 0 // + 15
-3/7*b = 15 // : -3/7
b = 15/(-3/7)
b = -35
b = -35
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