(x-3)+x=21

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Solution for (x-3)+x=21 equation:


Simplifying
(x + -3) + x = 21

Reorder the terms:
(-3 + x) + x = 21

Remove parenthesis around (-3 + x)
-3 + x + x = 21

Combine like terms: x + x = 2x
-3 + 2x = 21

Solving
-3 + 2x = 21

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 2x = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 2x = 21 + 3
2x = 21 + 3

Combine like terms: 21 + 3 = 24
2x = 24

Divide each side by '2'.
x = 12

Simplifying
x = 12

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