12+x+3x=20

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Solution for 12+x+3x=20 equation: 


Simplifying
12 + x + 3x = 20

Combine like terms: x + 3x = 4x
12 + 4x = 20

Solving
12 + 4x = 20

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 4x = 20 + -12

Combine like terms: 12 + -12 = 0
0 + 4x = 20 + -12
4x = 20 + -12

Combine like terms: 20 + -12 = 8
4x = 8

Divide each side by '4'.
x = 2

Simplifying
x = 2

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