"...you throw a triangle out the window..." LMAOOO I laughed so hard
If triangle ABC is congruent to triangle DEF, then line AB is congruent to line DE by CPCTC (Corresponding Parts of Congruent Triangles are Congruent).
130x5=650
650-104=546
546-137=409
409-154=255
255-131=124
x=124
