-7x-7x=28

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Solution for -7x-7x=28 equation: 



-7x-7x=28

We move all terms to the left:

-7x-7x-(28)=0

We add all the numbers together, and all the variables

-14x-28=0

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

-14x=28

x=28/-14

x=-2

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