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-2(5-3a)=50
We move all terms to the left:
-2(5-3a)-(50)=0
We add all the numbers together, and all the variables
-2(-3a+5)-50=0
We multiply parentheses
6a-10-50=0
We add all the numbers together, and all the variables
6a-60=0
We move all terms containing a to the left, all other terms to the right
6a=60
a=60/6
a=10
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