3+4+x=12

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Solution for 3+4+x=12 equation: 


Simplifying
3 + 4 + x = 12

Combine like terms: 3 + 4 = 7
7 + x = 12

Solving
7 + x = 12

Solving for variable 'x'.

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

Add '-7' to each side of the equation.
7 + -7 + x = 12 + -7

Combine like terms: 7 + -7 = 0
0 + x = 12 + -7
x = 12 + -7

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

Simplifying
x = 5

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