Question

Find the value of x when 5x + 6 - 2x = 9.

Answer 1

5x+6-2x=9
3x+6=9
3x=3
x=1

Answer 2

Reeember, we can do anything to an equation as long as we do it to both sides

and commutative property
a+b=b+a

5x+6-2x=9
group like terms
5x-2x+6=9
add like terms
3x+6=9
minus 6 both sides
3x=3
divide both sides by 3
x=1