Answer:
an infinite number
Step-by-step explanation:
The equation simplifies to ...
12x -7 = 6x +10 +6x -17 . . . eliminate parentheses
12x -7 = 12x -7 . . . . . . . . collect terms
0 = 0 . . . . subtract (12x-7) from both sides
This is true for all values of x. There are an infinite number of solutions.
