3x-21=-4x-7

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



3x-21=-4x-7

We move all terms to the left:

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

We get rid of parentheses

3x+4x+7-21=0

We add all the numbers together, and all the variables

7x-14=0

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

7x=14

x=14/7

x=2

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