How to solve an expression to its simplist form

to solve an expression to its most simple form you must combine like terms this means combining the terms that have the same variable. for example

8+5y+2y-4x+3y+2x+6x+3=78

8+3 =11

5y+2y+3y=10y

4x+2x+6x=12x

=78

the simple form of this equation would be

11-10y+12x

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.