31-15=U

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Solution for 31-15=U equation: 


Simplifying
31 + -15 = U

Combine like terms: 31 + -15 = 16
16 = U

Solving
16 = U

Solving for variable 'U'.

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

Add '-1U' to each side of the equation.
16 + -1U = U + -1U

Combine like terms: U + -1U = 0
16 + -1U = 0

Add '-16' to each side of the equation.
16 + -16 + -1U = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -1U = 0 + -16
-1U = 0 + -16

Combine like terms: 0 + -16 = -16
-1U = -16

Divide each side by '-1'.
U = 16

Simplifying
U = 16

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