81-1x=90-2x

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Solution for 81-1x=90-2x equation: 



81-1x=90-2x

We move all terms to the left:

81-1x-(90-2x)=0

We add all the numbers together, and all the variables

-1x-(-2x+90)+81=0

We get rid of parentheses

-1x+2x-90+81=0

We add all the numbers together, and all the variables

x-9=0

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

x=9

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