x+3+x=12

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Solution for x+3+x=12 equation: 


Simplifying
x + 3 + x = 12

Reorder the terms:
3 + x + x = 12

Combine like terms: x + x = 2x
3 + 2x = 12

Solving
3 + 2x = 12

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + 2x = 12 + -3

Combine like terms: 3 + -3 = 0
0 + 2x = 12 + -3
2x = 12 + -3

Combine like terms: 12 + -3 = 9
2x = 9

Divide each side by '2'.
x = 4.5

Simplifying
x = 4.5

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