4.2=a-3.6

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Solution for 4.2=a-3.6 equation: 



4.2=a-3.6

We move all terms to the left:

4.2-(a-3.6)=0

We get rid of parentheses

-a+3.6+4.2=0

We add all the numbers together, and all the variables

-1a+7.8=0

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

-a=-7.8

a=-7.8/-1

a=7+0.8/1

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