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19=10+3a
We move all terms to the left:
19-(10+3a)=0
We add all the numbers together, and all the variables
-(3a+10)+19=0
We get rid of parentheses
-3a-10+19=0
We add all the numbers together, and all the variables
-3a+9=0
We move all terms containing a to the left, all other terms to the right
-3a=-9
a=-9/-3
a=+3
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