8u-21=2u-9

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Solution for 8u-21=2u-9 equation:


Simplifying
8u + -21 = 2u + -9

Reorder the terms:
-21 + 8u = 2u + -9

Reorder the terms:
-21 + 8u = -9 + 2u

Solving
-21 + 8u = -9 + 2u

Solving for variable 'u'.

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

Add '-2u' to each side of the equation.
-21 + 8u + -2u = -9 + 2u + -2u

Combine like terms: 8u + -2u = 6u
-21 + 6u = -9 + 2u + -2u

Combine like terms: 2u + -2u = 0
-21 + 6u = -9 + 0
-21 + 6u = -9

Add '21' to each side of the equation.
-21 + 21 + 6u = -9 + 21

Combine like terms: -21 + 21 = 0
0 + 6u = -9 + 21
6u = -9 + 21

Combine like terms: -9 + 21 = 12
6u = 12

Divide each side by '6'.
u = 2

Simplifying
u = 2

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