If two roots of the equation $(x-1)(2x^2-3x+4)=0$ coincide with roots of the equation $x^3+(a+1)x^2+(a+b)x+b=0$, where $a,b \in R$, then $2(a+b)$ is equal to
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If two roots of the equation $(x-1)(2x^2-3x+4)=0$ coincide with roots of the equation $x^3+(a+1)x^2+(a+b)x+b=0$, where $a,b \in R$, then $2(a+b)$ is equal to