7u+15=9u-1

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Solution for 7u+15=9u-1 equation:


Simplifying
7u + 15 = 9u + -1

Reorder the terms:
15 + 7u = 9u + -1

Reorder the terms:
15 + 7u = -1 + 9u

Solving
15 + 7u = -1 + 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.
15 + 7u + -9u = -1 + 9u + -9u

Combine like terms: 7u + -9u = -2u
15 + -2u = -1 + 9u + -9u

Combine like terms: 9u + -9u = 0
15 + -2u = -1 + 0
15 + -2u = -1

Add '-15' to each side of the equation.
15 + -15 + -2u = -1 + -15

Combine like terms: 15 + -15 = 0
0 + -2u = -1 + -15
-2u = -1 + -15

Combine like terms: -1 + -15 = -16
-2u = -16

Divide each side by '-2'.
u = 8

Simplifying
u = 8

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