You can put this solution on YOUR website! First multiply 2 by (a-8) to give 2a-16. Do the same for 5 and (a+10).
This gives 2a-16+7=5a+10-3a-19
Take 3a away from 5a to give 2a and take 19 away from 10 to give -9. Also add 7 to -16 to give -9.
We know this must be true, for all real values of a!
