21=3(x-7)

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Solution for 21=3(x-7) equation:


Simplifying
21 = 3(x + -7)

Reorder the terms:
21 = 3(-7 + x)
21 = (-7 * 3 + x * 3)
21 = (-21 + 3x)

Solving
21 = -21 + 3x

Solving for variable 'x'.

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

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

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

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

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

Combine like terms: -21 + -21 = -42
-3x = -42

Divide each side by '-3'.
x = 14

Simplifying
x = 14

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