7u-9=8u

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Solution for 7u-9=8u equation:


Simplifying
7u + -9 = 8u

Reorder the terms:
-9 + 7u = 8u

Solving
-9 + 7u = 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.
-9 + 7u + -8u = 8u + -8u

Combine like terms: 7u + -8u = -1u
-9 + -1u = 8u + -8u

Combine like terms: 8u + -8u = 0
-9 + -1u = 0

Add '9' to each side of the equation.
-9 + 9 + -1u = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1u = 0 + 9
-1u = 0 + 9

Combine like terms: 0 + 9 = 9
-1u = 9

Divide each side by '-1'.
u = -9

Simplifying
u = -9

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