7.1=8.9-0.2x

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Solution for 7.1=8.9-0.2x equation: 



7.1=8.9-0.2x

We move all terms to the left:

7.1-(8.9-0.2x)=0

We add all the numbers together, and all the variables

-(-0.2x+8.9)+7.1=0

We get rid of parentheses

0.2x-8.9+7.1=0

We add all the numbers together, and all the variables

0.2x-1.8=0

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

0.2x=1.8

x=1.8/0.2

x=9

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