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[tex]-\dfrac12\left(-\dfrac32m+m+4\right)+3m=-\dfrac12\cdot\left(-\dfrac32m\right)+\left(-\dfrac12\right)\cdot m+\left(-\dfrac12\right)\cdot4+3m=\dfrac34m-\dfrac12m-2+3m=3\dfrac14m-2[/tex]