3x+7=4x+21

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



3x+7=4x+21

We move all terms to the left:

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

We get rid of parentheses

3x-4x-21+7=0

We add all the numbers together, and all the variables

-1x-14=0

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

-x=14

x=14/-1

x=-14

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