The expression is \(12b + 4b^{2} - 10b\). First, combine the like terms involving \(b\): \[ 12b - 10b = 2b. \]
After combining like terms, the expression becomes: \[ 4b^{2} + 2b. \]
The simplified form of the expression is: \[ \boxed{4b^{2} + 2b}. \]
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