9u-21=-8(u-8)

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Solution for 9u-21=-8(u-8) equation:


Simplifying
9u + -21 = -8(u + -8)

Reorder the terms:
-21 + 9u = -8(u + -8)

Reorder the terms:
-21 + 9u = -8(-8 + u)
-21 + 9u = (-8 * -8 + u * -8)
-21 + 9u = (64 + -8u)

Solving
-21 + 9u = 64 + -8u

Solving for variable 'u'.

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

Add '8u' to each side of the equation.
-21 + 9u + 8u = 64 + -8u + 8u

Combine like terms: 9u + 8u = 17u
-21 + 17u = 64 + -8u + 8u

Combine like terms: -8u + 8u = 0
-21 + 17u = 64 + 0
-21 + 17u = 64

Add '21' to each side of the equation.
-21 + 21 + 17u = 64 + 21

Combine like terms: -21 + 21 = 0
0 + 17u = 64 + 21
17u = 64 + 21

Combine like terms: 64 + 21 = 85
17u = 85

Divide each side by '17'.
u = 5

Simplifying
u = 5

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