3x+21=5x-7

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Solution for 3x+21=5x-7 equation: 



3x+21=5x-7

We move all terms to the left:

3x+21-(5x-7)=0

We get rid of parentheses

3x-5x+7+21=0

We add all the numbers together, and all the variables

-2x+28=0

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

-2x=-28

x=-28/-2

x=+14

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