4x-3.9=8.7

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Solution for 4x-3.9=8.7 equation: 



4x-3.9=8.7

We move all terms to the left:

4x-3.9-(8.7)=0

We add all the numbers together, and all the variables

4x-12.6=0

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

4x=12.6

x=12.6/4

x=3+0.6/4

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