I'm pretty sure it's -4x.
Top 1. Substitute 3y on both sides of the equation.
Bottom 2. Substitute 2y on both sides of the equation
3y and 2y cancel
Divide x by 4 and 26 by 4.
Is there die points on a graph or decimal?
I have not done this for years but there is many calculators that can show you step by step online. I recommend using these
Since the triangles are similar, then 32 = x+7 those two angles are too
solve for "x"
now using proportions

solve for JK

solve for KG
the scale factor of the perimeter of both triangles is just the same as the ratio of the sides, or
Answer:
(6x²-11x) that's the answer :)