7-3x=4x+21

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



7-3x=4x+21

We move all terms to the left:

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

We get rid of parentheses

-3x-4x-21+7=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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