7=2x+9=90

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Solution for 7=2x+9=90 equation: 



7=2x+9=90

We move all terms to the left:

7-(2x+9)=0

We get rid of parentheses

-2x-9+7=0

We add all the numbers together, and all the variables

-2x-2=0

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

-2x=2

x=2/-2

x=-1

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