20=19-n

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Solution for 20=19-n equation:


Simplifying
20 = 19 + -1n

Solving
20 = 19 + -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.
20 + n = 19 + -1n + n

Combine like terms: -1n + n = 0
20 + n = 19 + 0
20 + n = 19

Add '-20' to each side of the equation.
20 + -20 + n = 19 + -20

Combine like terms: 20 + -20 = 0
0 + n = 19 + -20
n = 19 + -20

Combine like terms: 19 + -20 = -1
n = -1

Simplifying
n = -1

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