a-4a=2.1

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Solution for a-4a=2.1 equation: 



a-4a=2.1

We move all terms to the left:

a-4a-(2.1)=0

We add all the numbers together, and all the variables

-3a-2.1=0

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

-3a=2.1

a=2.1/-3

a=-2.1/3

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