8.7=9.9-0.4x

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Solution for 8.7=9.9-0.4x equation: 



8.7=9.9-0.4x

We move all terms to the left:

8.7-(9.9-0.4x)=0

We add all the numbers together, and all the variables

-(-0.4x+9.9)+8.7=0

We get rid of parentheses

0.4x-9.9+8.7=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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