8.1+0.8x=0.9

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Solution for 8.1+0.8x=0.9 equation: 



8.1+0.8x=0.9

We move all terms to the left:

8.1+0.8x-(0.9)=0

We add all the numbers together, and all the variables

0.8x+7.2=0

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

0.8x=-7.2

x=-7.2/0.8

x=-9

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