1+2=x

Solution for 1+2=x equation:

Simplifying
1 + 2 = x

Combine like terms: 1 + 2 = 3
3 = x

Solving
3 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
3 + -1x = x + -1x

Combine like terms: x + -1x = 0
3 + -1x = 0

Add '-3' to each side of the equation.
3 + -3 + -1x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1x = 0 + -3
-1x = 0 + -3

Combine like terms: 0 + -3 = -3
-1x = -3

Divide each side by '-1'.
x = 3

Simplifying
x = 3