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-8a+24=2(-2a+2)
We move all terms to the left:
-8a+24-(2(-2a+2))=0
We calculate terms in parentheses: -(2(-2a+2)), so:We get rid of parentheses
2(-2a+2)
We multiply parentheses
-4a+4
Back to the equation:
-(-4a+4)
-8a+4a-4+24=0
We add all the numbers together, and all the variables
-4a+20=0
We move all terms containing a to the left, all other terms to the right
-4a=-20
a=-20/-4
a=+5
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