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7a+2=10a+28
We move all terms to the left:
7a+2-(10a+28)=0
We get rid of parentheses
7a-10a-28+2=0
We add all the numbers together, and all the variables
-3a-26=0
We move all terms containing a to the left, all other terms to the right
-3a=26
a=26/-3
a=-8+2/3
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