Faceing math lesson 7 multi-step equations with variables on both sides

7) 2x + 2 = 10x + 4

   -8x = -2

   x  = 1/4

8) -x - 5 = 2x + 10

   -3x = 15

   x = -5

9) x + 3 = -5x

   6x = -3

   x = -1/2

10) -x - 10 = -3x - 8

     2x = 2

     x = 1

11) 1/2x = -3/2x + 4

    2x = 4

    x = 1/2

12) 3x -8 = -8 + 3x

     0 = 0

Hope this helps! ;)

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.