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10-2a=-5a-50
We move all terms to the left:
10-2a-(-5a-50)=0
We get rid of parentheses
-2a+5a+50+10=0
We add all the numbers together, and all the variables
3a+60=0
We move all terms containing a to the left, all other terms to the right
3a=-60
a=-60/3
a=-20
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