21=3(5-x)

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


Simplifying
21 = 3(5 + -1x)
21 = (5 * 3 + -1x * 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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