.9*a=1.8

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Solution for .9*a=1.8 equation: 



.9a=1.8

We move all terms to the left:

.9a-(1.8)=0

We add all the numbers together, and all the variables

.9a-1.8=0

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

.9a=1.8

a=1.8/.9

a=2

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