6x-(3x-6)=21

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Solution for 6x-(3x-6)=21 equation:


Simplifying
6x + -1(3x + -6) = 21

Reorder the terms:
6x + -1(-6 + 3x) = 21
6x + (-6 * -1 + 3x * -1) = 21
6x + (6 + -3x) = 21

Reorder the terms:
6 + 6x + -3x = 21

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

Solving
6 + 3x = 21

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 3x = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 3x = 21 + -6
3x = 21 + -6

Combine like terms: 21 + -6 = 15
3x = 15

Divide each side by '3'.
x = 5

Simplifying
x = 5

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