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b in (-oo:+oo)
9/10-6*b = 429/10 // - 429/10
9/10-6*b-(429/10) = 0
9/10-6*b-429/10 = 0
-6*b-42 = 0 // + 42
-6*b = 42 // : -6
b = 42/(-6)
b = -7
b = -7
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