The answer would be 7. The two minus signs cancel each other out and turn into a plus sign.
AAS congruence theorem.
We know that <H is congruent to <F and <GJH is congruent to <JGF.
We also know that JG is congruent to JG, which gives us a side and two angles, so AAS would prove them congruent.
Quotient: 5x+5
Remainder: -5
