PLS I WILL GIVE BRAINLYIST

(03.04 LC)
The sum of two numbers is 60. The greater number is 6 more than the smaller number. Which equation can be used to solve for the smaller number?
x + (x + 6) = 60
x-(x + 6) = 60
x(x + 6) = 60
x(x-6) = 60