For this case, we have the following expression:

We simplify the expression:
If we add similar terms, taking into account that different signs are subtracted and the sign of the greater one is placed, we have that 
So, we have to:

Answer:
-3x + x + 5 = -2x + 5
The percent would be 29%. You need to move the decimal to the right twice.
René Descartes was the person who created analytic geometry and the Cartesian coordinate system
20 with a number minus what will equal 9. ^_^