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10a-20=10+5a
We move all terms to the left:
10a-20-(10+5a)=0
We add all the numbers together, and all the variables
10a-(5a+10)-20=0
We get rid of parentheses
10a-5a-10-20=0
We add all the numbers together, and all the variables
5a-30=0
We move all terms containing a to the left, all other terms to the right
5a=30
a=30/5
a=6
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