21=3(x+2)

Solution for 21=3(x+2) equation:

Simplifying
21 = 3(x + 2)

Reorder the terms:
21 = 3(2 + x)
21 = (2 * 3 + x * 3)
21 = (6 + 3x)

Solving
21 = 6 + 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 = 6 + 3x + -3x

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

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

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

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

Divide each side by '-3'.
x = 5

Simplifying
x = 5