8u-20=-7+9u

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Solution for 8u-20=-7+9u equation:


Simplifying
8u + -20 = -7 + 9u

Reorder the terms:
-20 + 8u = -7 + 9u

Solving
-20 + 8u = -7 + 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.
-20 + 8u + -9u = -7 + 9u + -9u

Combine like terms: 8u + -9u = -1u
-20 + -1u = -7 + 9u + -9u

Combine like terms: 9u + -9u = 0
-20 + -1u = -7 + 0
-20 + -1u = -7

Add '20' to each side of the equation.
-20 + 20 + -1u = -7 + 20

Combine like terms: -20 + 20 = 0
0 + -1u = -7 + 20
-1u = -7 + 20

Combine like terms: -7 + 20 = 13
-1u = 13

Divide each side by '-1'.
u = -13

Simplifying
u = -13

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