1x+3x=12

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Solution for 1x+3x=12 equation: 


Simplifying
1x + 3x = 12

Combine like terms: 1x + 3x = 4x
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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