7.7=2.1-7x

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Solution for 7.7=2.1-7x equation: 



7.7=2.1-7x

We move all terms to the left:

7.7-(2.1-7x)=0

We add all the numbers together, and all the variables

-(-7x+2.1)+7.7=0

We get rid of parentheses

7x-2.1+7.7=0

We add all the numbers together, and all the variables

7x+5.6=0

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

7x=-5.6

x=-5.6/7

x=-3.5/4.375

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