$\frac{6x^2-31x+35}{2x-7}$
$-4+\left(-6+1\right)+3-\left[3+\left(1-2\right)+2\right]+1-7$
$f\left(x\right)=3x^2+2x+6\:donde\:\frac{f\left(2\right)}{f\left(1\right)}$
$3\left(x-1\right)-2$
$6w-14$
$\frac{7x+1}{8x-2}$
$\left(x+2\right)\left(x+3\right)e$
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