3x-21=10x+21

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Solution for 3x-21=10x+21 equation: 



3x-21=10x+21

We move all terms to the left:

3x-21-(10x+21)=0

We get rid of parentheses

3x-10x-21-21=0

We add all the numbers together, and all the variables

-7x-42=0

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

-7x=42

x=42/-7

x=-6

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