x+(40-x)=40

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Solution for x+(40-x)=40 equation: 


Simplifying
x + (40 + -1x) = 40

Remove parenthesis around (40 + -1x)
x + 40 + -1x = 40

Reorder the terms:
40 + x + -1x = 40

Combine like terms: x + -1x = 0
40 + 0 = 40
40 = 40

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

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

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

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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