C.) 5 you equal the two equations together since they are congruent to each other and you solve the 2 step equation. 2x-7=5x-25 you first subtract the 2x from 5x and get 3x so now you are left with -7=3x-25 add the -25 to the -7 and you get 18 leaving you with 18=3x divide the 3x to 18 and you get 6. Sub in 6 to the AC equation 2 (6) -7 which equals 5
