10.2=0.85*a

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Solution for 10.2=0.85*a equation: 



10.2=0.85a

We move all terms to the left:

10.2-(0.85a)=0

We add all the numbers together, and all the variables

-(+0.85a)+10.2=0

We get rid of parentheses

-0.85a+10.2=0

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

-0.85a=-10.2

a=-10.2/-0.85

a=+12

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