91=5u-9

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Solution for 91=5u-9 equation:


Simplifying
91 = 5u + -9

Reorder the terms:
91 = -9 + 5u

Solving
91 = -9 + 5u

Solving for variable 'u'.

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

Add '-5u' to each side of the equation.
91 + -5u = -9 + 5u + -5u

Combine like terms: 5u + -5u = 0
91 + -5u = -9 + 0
91 + -5u = -9

Add '-91' to each side of the equation.
91 + -91 + -5u = -9 + -91

Combine like terms: 91 + -91 = 0
0 + -5u = -9 + -91
-5u = -9 + -91

Combine like terms: -9 + -91 = -100
-5u = -100

Divide each side by '-5'.
u = 20

Simplifying
u = 20

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