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-a+6-5a=-2(a+3)
We move all terms to the left:
-a+6-5a-(-2(a+3))=0
We add all the numbers together, and all the variables
-6a-(-2(a+3))+6=0
We calculate terms in parentheses: -(-2(a+3)), so:We get rid of parentheses
-2(a+3)
We multiply parentheses
-2a-6
Back to the equation:
-(-2a-6)
-6a+2a+6+6=0
We add all the numbers together, and all the variables
-4a+12=0
We move all terms containing a to the left, all other terms to the right
-4a=-12
a=-12/-4
a=+3
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