12*3-42+20=x

Solution for 12*3-42+20=x equation:

Simplifying
12 * 3 + -42 + 20 = x

Multiply 12 * 3
36 + -42 + 20 = x

Combine like terms: 36 + -42 = -6
-6 + 20 = x

Combine like terms: -6 + 20 = 14
14 = x

Solving
14 = x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1x' to each side of the equation.
14 + -1x = x + -1x

Combine like terms: x + -1x = 0
14 + -1x = 0

Add '-14' to each side of the equation.
14 + -14 + -1x = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -1x = 0 + -14
-1x = 0 + -14

Combine like terms: 0 + -14 = -14
-1x = -14

Divide each side by '-1'.
x = 14

Simplifying
x = 14