2x-(9-3x)=21

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Solution for 2x-(9-3x)=21 equation:


Simplifying
2x + -1(9 + -3x) = 21
2x + (9 * -1 + -3x * -1) = 21
2x + (-9 + 3x) = 21

Reorder the terms:
-9 + 2x + 3x = 21

Combine like terms: 2x + 3x = 5x
-9 + 5x = 21

Solving
-9 + 5x = 21

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + 5x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 5x = 21 + 9
5x = 21 + 9

Combine like terms: 21 + 9 = 30
5x = 30

Divide each side by '5'.
x = 6

Simplifying
x = 6

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