3x+x=5+7

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Solution for 3x+x=5+7 equation: 


Simplifying
3x + x = 5 + 7

Combine like terms: 3x + x = 4x
4x = 5 + 7

Combine like terms: 5 + 7 = 12
4x = 12

Solving
4x = 12

Solving for variable 'x'.

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

Divide each side by '4'.
x = 3

Simplifying
x = 3

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