2x+21=9x-57

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Solution for 2x+21=9x-57 equation: 



2x+21=9x-57

We move all terms to the left:

2x+21-(9x-57)=0

We get rid of parentheses

2x-9x+57+21=0

We add all the numbers together, and all the variables

-7x+78=0

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

-7x=-78

x=-78/-7

x=11+1/7

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