21=5u+6

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Solution for 21=5u+6 equation:


Simplifying
21 = 5u + 6

Reorder the terms:
21 = 6 + 5u

Solving
21 = 6 + 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.
21 + -5u = 6 + 5u + -5u

Combine like terms: 5u + -5u = 0
21 + -5u = 6 + 0
21 + -5u = 6

Add '-21' to each side of the equation.
21 + -21 + -5u = 6 + -21

Combine like terms: 21 + -21 = 0
0 + -5u = 6 + -21
-5u = 6 + -21

Combine like terms: 6 + -21 = -15
-5u = -15

Divide each side by '-5'.
u = 3

Simplifying
u = 3

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