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b in (-oo:+oo)
(-2/3)*b-(3/10) = -63/10 // + -63/10
(-2/3)*b-(3/10)-(-63/10) = 0
(-2/3)*b-3/10+63/10 = 0
6-2/3*b = 0 // - 6
-2/3*b = -6 // : -2/3
b = -6/(-2/3)
b = 9
b = 9
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