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3a-(-6a)-10a=-19
We move all terms to the left:
3a-(-6a)-10a-(-19)=0
We add all the numbers together, and all the variables
-7a-(-6a)+19=0
We get rid of parentheses
-7a+6a+19=0
We add all the numbers together, and all the variables
-1a+19=0
We move all terms containing a to the left, all other terms to the right
-a=-19
a=-19/-1
a=+19
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