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2(-39+5)=-4(a+4)
We move all terms to the left:
2(-39+5)-(-4(a+4))=0
We add all the numbers together, and all the variables
-(-4(a+4))+2(-34)=0
We add all the numbers together, and all the variables
-(-4(a+4))-68=0
We calculate terms in parentheses: -(-4(a+4)), so:We get rid of parentheses
-4(a+4)
We multiply parentheses
-4a-16
Back to the equation:
-(-4a-16)
4a+16-68=0
We add all the numbers together, and all the variables
4a-52=0
We move all terms containing a to the left, all other terms to the right
4a=52
a=52/4
a=13
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