8u-7=21+3u

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Solution for 8u-7=21+3u equation:


Simplifying
8u + -7 = 21 + 3u

Reorder the terms:
-7 + 8u = 21 + 3u

Solving
-7 + 8u = 21 + 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.
-7 + 8u + -3u = 21 + 3u + -3u

Combine like terms: 8u + -3u = 5u
-7 + 5u = 21 + 3u + -3u

Combine like terms: 3u + -3u = 0
-7 + 5u = 21 + 0
-7 + 5u = 21

Add '7' to each side of the equation.
-7 + 7 + 5u = 21 + 7

Combine like terms: -7 + 7 = 0
0 + 5u = 21 + 7
5u = 21 + 7

Combine like terms: 21 + 7 = 28
5u = 28

Divide each side by '5'.
u = 5.6

Simplifying
u = 5.6

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