7-2x-2x=-21

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



7-2x-2x=-21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-4x+28=0

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

-4x=-28

x=-28/-4

x=+7

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