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b in (-oo:+oo)
-3*b-(3*b)-7 = 53 // - 53
-3*b-(3*b)-53-7 = 0
-3*b-3*b-53-7 = 0
-6*b-60 = 0 // + 60
-6*b = 60 // : -6
b = 60/(-6)
b = -10
b = -10
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