21=3(5x+2)

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Solution for 21=3(5x+2) equation:


Simplifying
21 = 3(5x + 2)

Reorder the terms:
21 = 3(2 + 5x)
21 = (2 * 3 + 5x * 3)
21 = (6 + 15x)

Solving
21 = 6 + 15x

Solving for variable 'x'.

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

Add '-15x' to each side of the equation.
21 + -15x = 6 + 15x + -15x

Combine like terms: 15x + -15x = 0
21 + -15x = 6 + 0
21 + -15x = 6

Add '-21' to each side of the equation.
21 + -21 + -15x = 6 + -21

Combine like terms: 21 + -21 = 0
0 + -15x = 6 + -21
-15x = 6 + -21

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

Divide each side by '-15'.
x = 1

Simplifying
x = 1

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