(x+21)=3(x+3)

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


Simplifying
(x + 21) = 3(x + 3)

Reorder the terms:
(21 + x) = 3(x + 3)

Remove parenthesis around (21 + x)
21 + x = 3(x + 3)

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

Solving
21 + x = 9 + 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 + x + -3x = 9 + 3x + -3x

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

Combine like terms: 3x + -3x = 0
21 + -2x = 9 + 0
21 + -2x = 9

Add '-21' to each side of the equation.
21 + -21 + -2x = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = 9 + -21
-2x = 9 + -21

Combine like terms: 9 + -21 = -12
-2x = -12

Divide each side by '-2'.
x = 6

Simplifying
x = 6

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