9x-(3x+21)=21

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


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

Reorder the terms:
9x + -1(21 + 3x) = 21
9x + (21 * -1 + 3x * -1) = 21
9x + (-21 + -3x) = 21

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

Combine like terms: 9x + -3x = 6x
-21 + 6x = 21

Solving
-21 + 6x = 21

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 6x = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 6x = 21 + 21
6x = 21 + 21

Combine like terms: 21 + 21 = 42
6x = 42

Divide each side by '6'.
x = 7

Simplifying
x = 7

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