21=7(2x-8)

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Solution for 21=7(2x-8) equation:


Simplifying
21 = 7(2x + -8)

Reorder the terms:
21 = 7(-8 + 2x)
21 = (-8 * 7 + 2x * 7)
21 = (-56 + 14x)

Solving
21 = -56 + 14x

Solving for variable 'x'.

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

Add '-14x' to each side of the equation.
21 + -14x = -56 + 14x + -14x

Combine like terms: 14x + -14x = 0
21 + -14x = -56 + 0
21 + -14x = -56

Add '-21' to each side of the equation.
21 + -21 + -14x = -56 + -21

Combine like terms: 21 + -21 = 0
0 + -14x = -56 + -21
-14x = -56 + -21

Combine like terms: -56 + -21 = -77
-14x = -77

Divide each side by '-14'.
x = 5.5

Simplifying
x = 5.5

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