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9a+10=19a-10
We move all terms to the left:
9a+10-(19a-10)=0
We get rid of parentheses
9a-19a+10+10=0
We add all the numbers together, and all the variables
-10a+20=0
We move all terms containing a to the left, all other terms to the right
-10a=-20
a=-20/-10
a=+2
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