31=u-12

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Solution for 31=u-12 equation:


Simplifying
31 = u + -12

Reorder the terms:
31 = -12 + u

Solving
31 = -12 + 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.
31 + -1u = -12 + u + -1u

Combine like terms: u + -1u = 0
31 + -1u = -12 + 0
31 + -1u = -12

Add '-31' to each side of the equation.
31 + -31 + -1u = -12 + -31

Combine like terms: 31 + -31 = 0
0 + -1u = -12 + -31
-1u = -12 + -31

Combine like terms: -12 + -31 = -43
-1u = -43

Divide each side by '-1'.
u = 43

Simplifying
u = 43

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