21a=28a-6=-10.2

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Solution for 21a=28a-6=-10.2 equation: 



21a=28a-6=-10.2

We move all terms to the left:

21a-(28a-6)=0

We get rid of parentheses

21a-28a+6=0

We add all the numbers together, and all the variables

-7a+6=0

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

-7a=-6

a=-6/-7

a=6/7

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