$$\frac { ( 4 + 2 c ) ( 5 - x ) } { ( 2 + x ) ( 7 - x ) }$$
$\frac{2\left(5-x\right)\left(c+2\right)}{\left(7-x\right)\left(x+2\right)}$
$$\frac{20-4x+10c-2cx}{\left(2+x\right)\left(7-x\right)}$$
$$\frac{20-4x+10c-2cx}{14-2x+7x-x^{2}}$$
$$\frac{20-4x+10c-2cx}{14+5x-x^{2}}$$
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$-\frac{2\left(cx+2x-5c-10\right)}{\left(7-x\right)\left(x+2\right)}$
