-20=1800+90x

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Solution for -20=1800+90x equation: 



-20=1800+90x

We move all terms to the left:

-20-(1800+90x)=0

We add all the numbers together, and all the variables

-(90x+1800)-20=0

We get rid of parentheses

-90x-1800-20=0

We add all the numbers together, and all the variables

-90x-1820=0

We move all terms containing x to the left, all other terms to the right

-90x=1820

x=1820/-90

x=-20+2/9

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