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5=10-5a
We move all terms to the left:
5-(10-5a)=0
We add all the numbers together, and all the variables
-(-5a+10)+5=0
We get rid of parentheses
5a-10+5=0
We add all the numbers together, and all the variables
5a-5=0
We move all terms containing a to the left, all other terms to the right
5a=5
a=5/5
a=1
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