7x+11=9x-21=90

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Solution for 7x+11=9x-21=90 equation: 



7x+11=9x-21=90

We move all terms to the left:

7x+11-(9x-21)=0

We get rid of parentheses

7x-9x+21+11=0

We add all the numbers together, and all the variables

-2x+32=0

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

-2x=-32

x=-32/-2

x=+16

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