PREALGEBRA
posted by Anonymous .
Solve the equation.
3x + 7x =120
It will help if you explain it too. Thanks!

3x + 7x =120
10x = 120
This means that 10 time some number is 120.
Divide both sides of the equation by 10.
x = 120/10
x = ? 
combine like terms
10x=120
divide both sides by 10
x= 12