21=5(x+6)-8x

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Solution for 21=5(x+6)-8x equation:


Simplifying
21 = 5(x + 6) + -8x

Reorder the terms:
21 = 5(6 + x) + -8x
21 = (6 * 5 + x * 5) + -8x
21 = (30 + 5x) + -8x

Combine like terms: 5x + -8x = -3x
21 = 30 + -3x

Solving
21 = 30 + -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 = 30 + -3x + 3x

Combine like terms: -3x + 3x = 0
21 + 3x = 30 + 0
21 + 3x = 30

Add '-21' to each side of the equation.
21 + -21 + 3x = 30 + -21

Combine like terms: 21 + -21 = 0
0 + 3x = 30 + -21
3x = 30 + -21

Combine like terms: 30 + -21 = 9
3x = 9

Divide each side by '3'.
x = 3

Simplifying
x = 3

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