7.9=9.1-0.4x

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Solution for 7.9=9.1-0.4x equation: 



7.9=9.1-0.4x

We move all terms to the left:

7.9-(9.1-0.4x)=0

We add all the numbers together, and all the variables

-(-0.4x+9.1)+7.9=0

We get rid of parentheses

0.4x-9.1+7.9=0

We add all the numbers together, and all the variables

0.4x-1.2=0

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

0.4x=1.2

x=1.2/0.4

x=2+0.4/0.4

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