21=3(3x+4)

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Solution for 21=3(3x+4) equation:


Simplifying
21 = 3(3x + 4)

Reorder the terms:
21 = 3(4 + 3x)
21 = (4 * 3 + 3x * 3)
21 = (12 + 9x)

Solving
21 = 12 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
21 + -9x = 12 + 9x + -9x

Combine like terms: 9x + -9x = 0
21 + -9x = 12 + 0
21 + -9x = 12

Add '-21' to each side of the equation.
21 + -21 + -9x = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -9x = 12 + -21
-9x = 12 + -21

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

Divide each side by '-9'.
x = 1

Simplifying
x = 1

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