21=3(5+x)

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Solution for 21=3(5+x) equation:


Simplifying
21 = 3(5 + x)
21 = (5 * 3 + x * 3)
21 = (15 + 3x)

Solving
21 = 15 + 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 = 15 + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + -3x = 15 + 0
21 + -3x = 15

Add '-21' to each side of the equation.
21 + -21 + -3x = 15 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = 15 + -21
-3x = 15 + -21

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

Divide each side by '-3'.
x = 2

Simplifying
x = 2

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