Answer:
x = 5, FG = 50, GH = 50 and FH = 100
Explanation:
The lines on each of the line segments mean that each side of the segment is congruent or equal to each other so we can make 10x = 7x + 15 next to solve for x, it needs to get by itself so first we would subtract the 7x from both sides to make 3x = 15, next we would divide each side by 3 to get the x by itself making x=5
Next all you do is plug in the 5 for x:
10(5) = 50
and
7(5) + 15 = 50
and since they both equal each other we know that the math was correct and the total line of FH is 50 + 50 which is 100