3x+21=10x+30

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Solution for 3x+21=10x+30 equation: 



3x+21=10x+30

We move all terms to the left:

3x+21-(10x+30)=0

We get rid of parentheses

3x-10x-30+21=0

We add all the numbers together, and all the variables

-7x-9=0

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

-7x=9

x=9/-7

x=-1+2/7

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