2x-4=21+7x

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Solution for 2x-4=21+7x equation: 



2x-4=21+7x

We move all terms to the left:

2x-4-(21+7x)=0

We add all the numbers together, and all the variables

2x-(7x+21)-4=0

We get rid of parentheses

2x-7x-21-4=0

We add all the numbers together, and all the variables

-5x-25=0

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

-5x=25

x=25/-5

x=-5

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