x-9=21-x

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Solution for x-9=21-x equation:


Simplifying
x + -9 = 21 + -1x

Reorder the terms:
-9 + x = 21 + -1x

Solving
-9 + x = 21 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
-9 + x + x = 21 + -1x + x

Combine like terms: x + x = 2x
-9 + 2x = 21 + -1x + x

Combine like terms: -1x + x = 0
-9 + 2x = 21 + 0
-9 + 2x = 21

Add '9' to each side of the equation.
-9 + 9 + 2x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 2x = 21 + 9
2x = 21 + 9

Combine like terms: 21 + 9 = 30
2x = 30

Divide each side by '2'.
x = 15

Simplifying
x = 15

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