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28-7a=6+4a
We move all terms to the left:
28-7a-(6+4a)=0
We add all the numbers together, and all the variables
-7a-(4a+6)+28=0
We get rid of parentheses
-7a-4a-6+28=0
We add all the numbers together, and all the variables
-11a+22=0
We move all terms containing a to the left, all other terms to the right
-11a=-22
a=-22/-11
a=+2
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