57=9+4u

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Solution for 57=9+4u equation:


Simplifying
57 = 9 + 4u

Solving
57 = 9 + 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.
57 + -4u = 9 + 4u + -4u

Combine like terms: 4u + -4u = 0
57 + -4u = 9 + 0
57 + -4u = 9

Add '-57' to each side of the equation.
57 + -57 + -4u = 9 + -57

Combine like terms: 57 + -57 = 0
0 + -4u = 9 + -57
-4u = 9 + -57

Combine like terms: 9 + -57 = -48
-4u = -48

Divide each side by '-4'.
u = 12

Simplifying
u = 12

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