6x-(3x-21)=57

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Solution for 6x-(3x-21)=57 equation:


Simplifying
6x + -1(3x + -21) = 57

Reorder the terms:
6x + -1(-21 + 3x) = 57
6x + (-21 * -1 + 3x * -1) = 57
6x + (21 + -3x) = 57

Reorder the terms:
21 + 6x + -3x = 57

Combine like terms: 6x + -3x = 3x
21 + 3x = 57

Solving
21 + 3x = 57

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 + 3x = 57 + -21

Combine like terms: 21 + -21 = 0
0 + 3x = 57 + -21
3x = 57 + -21

Combine like terms: 57 + -21 = 36
3x = 36

Divide each side by '3'.
x = 12

Simplifying
x = 12

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