3x-18=39 solve equations with variables

Solve for x:

3 x - 18 = 39

Add 18 to both sides:

3 x + (18 - 18) = 18 + 39

18 - 18 = 0:

3 x = 39 + 18

39 + 18 = 57:

3 x = 57

Divide both sides of 3 x = 57 by 3:

(3 x) / 3 = 57/3

3/3 = 1:

x = 57/3

The gcd of 57 and 3 is 3, so 57/3 = (3*19) / (3*1) = 3/3*19 = 19:

Answer: x = 19