3x=10x+21

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Solution for 3x=10x+21 equation: 



3x=10x+21

We move all terms to the left:

3x-(10x+21)=0

We get rid of parentheses

3x-10x-21=0

We add all the numbers together, and all the variables

-7x-21=0

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

-7x=21

x=21/-7

x=-3

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