7-u=u-9

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Solution for 7-u=u-9 equation:


Simplifying
7 + -1u = u + -9

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

Solving
7 + -1u = -9 + u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
7 + -1u + -1u = -9 + u + -1u

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

Combine like terms: u + -1u = 0
7 + -2u = -9 + 0
7 + -2u = -9

Add '-7' to each side of the equation.
7 + -7 + -2u = -9 + -7

Combine like terms: 7 + -7 = 0
0 + -2u = -9 + -7
-2u = -9 + -7

Combine like terms: -9 + -7 = -16
-2u = -16

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

Simplifying
u = 8

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