7^x+7^x+1+7^x+2+7^x+2=400

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Solution for 7^x+7^x+1+7^x+2+7^x+2=400 equation: 



7^x+7^x+1+7^x+2+7^x+2=400

We move all terms to the left:

7^x+7^x+1+7^x+2+7^x+2-(400)=0

We add all the numbers together, and all the variables

7^x+7^x+7^x+7^x-395=0

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

7^x+7^x+7^x+7^x=395

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