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4(a-3)=-2(-7a-9)
We move all terms to the left:
4(a-3)-(-2(-7a-9))=0
We multiply parentheses
4a-(-2(-7a-9))-12=0
We calculate terms in parentheses: -(-2(-7a-9)), so:We get rid of parentheses
-2(-7a-9)
We multiply parentheses
14a+18
Back to the equation:
-(14a+18)
4a-14a-18-12=0
We add all the numbers together, and all the variables
-10a-30=0
We move all terms containing a to the left, all other terms to the right
-10a=30
a=30/-10
a=-3
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