4x+7=2x-21

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



4x+7=2x-21

We move all terms to the left:

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

We get rid of parentheses

4x-2x+21+7=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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