21=5x-8x

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Solution for 21=5x-8x equation:


Simplifying
21 = 5x + -8x

Combine like terms: 5x + -8x = -3x
21 = -3x

Solving
21 = -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 = -3x + 3x

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

Add '-21' to each side of the equation.
21 + -21 + 3x = 0 + -21

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

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

Divide each side by '3'.
x = -7

Simplifying
x = -7

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