3x+x+8=20

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Solution for 3x+x+8=20 equation: 


Simplifying
3x + x + 8 = 20

Reorder the terms:
8 + 3x + x = 20

Combine like terms: 3x + x = 4x
8 + 4x = 20

Solving
8 + 4x = 20

Solving for variable 'x'.

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

Add '-8' to each side of the equation.
8 + -8 + 4x = 20 + -8

Combine like terms: 8 + -8 = 0
0 + 4x = 20 + -8
4x = 20 + -8

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

Divide each side by '4'.
x = 3

Simplifying
x = 3

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