What are you trying to do with this? I can help but what are you trying to do with it.
Answer:
x=9
Step-by-step explanation:
FE is 3x-7
since ΔABC≅ΔDEF the equivalent of FE is CB, or BC...which is 20
3x-7=20
3x=27
x=9
−2(13x−15)
distribute by multiplication -2 to 13x and -15
-26x+30
