Question on Finding the Value of x

Topic : Value of a Variable

Question : Solve for x, 6(x+5) = 3x - 12

Solution :
6(x+5) = 3x - 12
6x + 30 = 3x -12
6x -3x = -12 -30
3x = -42
x = -42/3
x = - 14

Value of x is - 14