40-9=n

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Solution for 40-9=n equation:


Simplifying
40 + -9 = n

Combine like terms: 40 + -9 = 31
31 = n

Solving
31 = n

Solving for variable 'n'.

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

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

Combine like terms: n + -1n = 0
31 + -1n = 0

Add '-31' to each side of the equation.
31 + -31 + -1n = 0 + -31

Combine like terms: 31 + -31 = 0
0 + -1n = 0 + -31
-1n = 0 + -31

Combine like terms: 0 + -31 = -31
-1n = -31

Divide each side by '-1'.
n = 31

Simplifying
n = 31

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