X+2=0 help thanks this is hard

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

How do i put 3(x+7) in distributive property