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10=2a+1
We move all terms to the left:
10-(2a+1)=0
We get rid of parentheses
-2a-1+10=0
We add all the numbers together, and all the variables
-2a+9=0
We move all terms containing a to the left, all other terms to the right
-2a=-9
a=-9/-2
a=4+1/2
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