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b in (-oo:+oo)
-63/10 = (-21/10)*b // - (-21/10)*b
-((-21/10)*b)-63/10 = 0
(21/10)*b-63/10 = 0
21/10*b-63/10 = 0 // + 63/10
21/10*b = 63/10 // : 21/10
b = 63/10/21/10
b = 3
b = 3
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