89=4u+13

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Solution for 89=4u+13 equation:


Simplifying
89 = 4u + 13

Reorder the terms:
89 = 13 + 4u

Solving
89 = 13 + 4u

Solving for variable 'u'.

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

Add '-4u' to each side of the equation.
89 + -4u = 13 + 4u + -4u

Combine like terms: 4u + -4u = 0
89 + -4u = 13 + 0
89 + -4u = 13

Add '-89' to each side of the equation.
89 + -89 + -4u = 13 + -89

Combine like terms: 89 + -89 = 0
0 + -4u = 13 + -89
-4u = 13 + -89

Combine like terms: 13 + -89 = -76
-4u = -76

Divide each side by '-4'.
u = 19

Simplifying
u = 19

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