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b in (-oo:+oo)
10-(3*b) = 19 // - 19
10-(3*b)-19 = 0
10-3*b-19 = 0
-3*b-9 = 0 // + 9
-3*b = 9 // : -3
b = 9/(-3)
b = -3
b = -3
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