O+40=28

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Solution for O+40=28 equation: 


Simplifying
O + 40 = 28

Reorder the terms:
40 + O = 28

Solving
40 + O = 28

Solving for variable 'O'.

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

Add '-40' to each side of the equation.
40 + -40 + O = 28 + -40

Combine like terms: 40 + -40 = 0
0 + O = 28 + -40
O = 28 + -40

Combine like terms: 28 + -40 = -12
O = -12

Simplifying
O = -12

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