10+9-x=12

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Solution for 10+9-x=12 equation: 


Simplifying
10 + 9 + -1x = 12

Combine like terms: 10 + 9 = 19
19 + -1x = 12

Solving
19 + -1x = 12

Solving for variable 'x'.

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

Add '-19' to each side of the equation.
19 + -19 + -1x = 12 + -19

Combine like terms: 19 + -19 = 0
0 + -1x = 12 + -19
-1x = 12 + -19

Combine like terms: 12 + -19 = -7
-1x = -7

Divide each side by '-1'.
x = 7

Simplifying
x = 7

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