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28+4a/2=3a
We move all terms to the left:
28+4a/2-(3a)=0
We add all the numbers together, and all the variables
-3a+4a/2+28=0
We multiply all the terms by the denominator
-3a*2+4a+28*2=0
We add all the numbers together, and all the variables
4a-3a*2+56=0
Wy multiply elements
4a-6a+56=0
We add all the numbers together, and all the variables
-2a+56=0
We move all terms containing a to the left, all other terms to the right
-2a=-56
a=-56/-2
a=+28
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