21=8(x-4)

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Solution for 21=8(x-4) equation:


Simplifying
21 = 8(x + -4)

Reorder the terms:
21 = 8(-4 + x)
21 = (-4 * 8 + x * 8)
21 = (-32 + 8x)

Solving
21 = -32 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
21 + -8x = -32 + 8x + -8x

Combine like terms: 8x + -8x = 0
21 + -8x = -32 + 0
21 + -8x = -32

Add '-21' to each side of the equation.
21 + -21 + -8x = -32 + -21

Combine like terms: 21 + -21 = 0
0 + -8x = -32 + -21
-8x = -32 + -21

Combine like terms: -32 + -21 = -53
-8x = -53

Divide each side by '-8'.
x = 6.625

Simplifying
x = 6.625

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