2n-4n=20

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Solution for 2n-4n=20 equation: 


Simplifying
2n + -4n = 20

Combine like terms: 2n + -4n = -2n
-2n = 20

Solving
-2n = 20

Solving for variable 'n'.

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

Divide each side by '-2'.
n = -10

Simplifying
n = -10

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