60x-3x to the second power divided by 3x

One way is to find ones or factors

example 4/2=2/2 times 2/1=1 times 2/1

then we undistribute the factor

we want a factor of 3x to make a one

60x=3x times 20

-3x^2=3x tiimes - x

use undistributive property which is

ab+ac=a (b+c)

so

60x-3x=3x (20) + 3x (-x) = 3x (20-x)

so now we have

[3x (20-x) ]/3x = (3x/3x) times (20-x) / 1=1 times 20-x=20-x

answer is 20-x