3.9=8.7-0.8x

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Solution for 3.9=8.7-0.8x equation: 



3.9=8.7-0.8x

We move all terms to the left:

3.9-(8.7-0.8x)=0

We add all the numbers together, and all the variables

-(-0.8x+8.7)+3.9=0

We get rid of parentheses

0.8x-8.7+3.9=0

We add all the numbers together, and all the variables

0.8x-4.8=0

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

0.8x=4.8

x=4.8/0.8

x=5+0.8/0.8

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