-3u+8u-21=9u+4-9

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Solution for -3u+8u-21=9u+4-9 equation:


Simplifying
-3u + 8u + -21 = 9u + 4 + -9

Reorder the terms:
-21 + -3u + 8u = 9u + 4 + -9

Combine like terms: -3u + 8u = 5u
-21 + 5u = 9u + 4 + -9

Reorder the terms:
-21 + 5u = 4 + -9 + 9u

Combine like terms: 4 + -9 = -5
-21 + 5u = -5 + 9u

Solving
-21 + 5u = -5 + 9u

Solving for variable 'u'.

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

Add '-9u' to each side of the equation.
-21 + 5u + -9u = -5 + 9u + -9u

Combine like terms: 5u + -9u = -4u
-21 + -4u = -5 + 9u + -9u

Combine like terms: 9u + -9u = 0
-21 + -4u = -5 + 0
-21 + -4u = -5

Add '21' to each side of the equation.
-21 + 21 + -4u = -5 + 21

Combine like terms: -21 + 21 = 0
0 + -4u = -5 + 21
-4u = -5 + 21

Combine like terms: -5 + 21 = 16
-4u = 16

Divide each side by '-4'.
u = -4

Simplifying
u = -4

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