For this case we have the following equation:

We must find the solution.
We add similar terms from the right side of the equation:

We subtract 5 from both sides of the equation:

We subtract 7x on both sides of the equation:

Different signs are subtracted and the sign of the major is placed:

We multiply by -1 on both sides of the equation:
Thus, the solution of the equation is
. -5 is not a solution to the equation.
Answer:
. -5 is not a solution to the equation