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-12-2a=-4(5+a)
We move all terms to the left:
-12-2a-(-4(5+a))=0
We add all the numbers together, and all the variables
-2a-(-4(a+5))-12=0
We calculate terms in parentheses: -(-4(a+5)), so:We get rid of parentheses
-4(a+5)
We multiply parentheses
-4a-20
Back to the equation:
-(-4a-20)
-2a+4a+20-12=0
We add all the numbers together, and all the variables
2a+8=0
We move all terms containing a to the left, all other terms to the right
2a=-8
a=-8/2
a=-4
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