.1x+.8x=9

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Solution for .1x+.8x=9 equation: 



.1x+.8x=9

We move all terms to the left:

.1x+.8x-(9)=0

We add all the numbers together, and all the variables

0.9x-9=0

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

0.9x=9

x=9/0.9

x=10

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