.9=4a+13

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Solution for .9=4a+13 equation: 



.9=4a+13

We move all terms to the left:

.9-(4a+13)=0

We add all the numbers together, and all the variables

-(4a+13)+0.9=0

We get rid of parentheses

-4a-13+0.9=0

We add all the numbers together, and all the variables

-4a-12.1=0

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

-4a=12.1

a=12.1/-4

a=-3+0.1/4

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