That will depend on where the equality sign is and the plus or minus values of 5x and 10 are of which none have been given.
5x plus 3 does equal 3 plus 5x; commutative law.
-10x + 5x = -5x
It is: 4X+X = 5X
It is: 5x
x=6
10x - 5x + 5x = 10x
5x+2x=7x2x + 5x = 7x
-5x^2 - 55x - 120
2x plus 5x simplified is 7x.
3
It is 5x - 4