3x+21=7x+4

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Solution for 3x+21=7x+4 equation: 



3x+21=7x+4

We move all terms to the left:

3x+21-(7x+4)=0

We get rid of parentheses

3x-7x-4+21=0

We add all the numbers together, and all the variables

-4x+17=0

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

-4x=-17

x=-17/-4

x=4+1/4

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