-8u-21=-3(u-8)

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Solution for -8u-21=-3(u-8) equation:


Simplifying
-8u + -21 = -3(u + -8)

Reorder the terms:
-21 + -8u = -3(u + -8)

Reorder the terms:
-21 + -8u = -3(-8 + u)
-21 + -8u = (-8 * -3 + u * -3)
-21 + -8u = (24 + -3u)

Solving
-21 + -8u = 24 + -3u

Solving for variable 'u'.

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

Add '3u' to each side of the equation.
-21 + -8u + 3u = 24 + -3u + 3u

Combine like terms: -8u + 3u = -5u
-21 + -5u = 24 + -3u + 3u

Combine like terms: -3u + 3u = 0
-21 + -5u = 24 + 0
-21 + -5u = 24

Add '21' to each side of the equation.
-21 + 21 + -5u = 24 + 21

Combine like terms: -21 + 21 = 0
0 + -5u = 24 + 21
-5u = 24 + 21

Combine like terms: 24 + 21 = 45
-5u = 45

Divide each side by '-5'.
u = -9

Simplifying
u = -9

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