20=n-2(10n+9)

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Solution for 20=n-2(10n+9) equation:


20=n-2(10n+9)

We simplify the equation to the form, which is simple to understand 
20=n-2(10n+9)

Reorder the terms in parentheses
20=n+(-20n-18)

Remove unnecessary parentheses
+20=+n-20n-18

We move all terms containing n to the left and all other terms to the right. 
-1n+20n=-18-20

We simplify left and right side of the equation. 
+19n=-38

We divide both sides of the equation by 19 to get n. 
n=-2

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