7=28x^-2

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Solution for 7=28x^-2 equation: 



7=28x^-2

We move all terms to the left:

7-(28x^-2)=0

We get rid of parentheses

-28x^+2+7=0

We add all the numbers together, and all the variables

-28x+9=0

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

-28x=-9

x=-9/-28

x=9/28

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