10+13-x=21

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Solution for 10+13-x=21 equation:


Simplifying
10 + 13 + -1x = 21

Combine like terms: 10 + 13 = 23
23 + -1x = 21

Solving
23 + -1x = 21

Solving for variable 'x'.

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

Add '-23' to each side of the equation.
23 + -23 + -1x = 21 + -23

Combine like terms: 23 + -23 = 0
0 + -1x = 21 + -23
-1x = 21 + -23

Combine like terms: 21 + -23 = -2
-1x = -2

Divide each side by '-1'.
x = 2

Simplifying
x = 2

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