13=20-n

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Solution for 13=20-n equation:


Simplifying
13 = 20 + -1n

Solving
13 = 20 + -1n

Solving for variable 'n'.

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

Add 'n' to each side of the equation.
13 + n = 20 + -1n + n

Combine like terms: -1n + n = 0
13 + n = 20 + 0
13 + n = 20

Add '-13' to each side of the equation.
13 + -13 + n = 20 + -13

Combine like terms: 13 + -13 = 0
0 + n = 20 + -13
n = 20 + -13

Combine like terms: 20 + -13 = 7
n = 7

Simplifying
n = 7

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