Answer
x=-8
Work Step by Step
$\frac{20}{14}=\frac{2-x}{7}$ cross multiply
$14(2-x)=140$ distributive property
$28-14x=140$ subtract 28 from both sides
$28-14x-28=140-28$ combine like terms
$-14x=112$ divide both sides by -14
$-14x\div-14=112\div-14$ divide
$x=-8$
