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-3(d+4)=-9
We move all terms to the left:
-3(d+4)-(-9)=0
We add all the numbers together, and all the variables
-3(d+4)+9=0
We multiply parentheses
-3d-12+9=0
We add all the numbers together, and all the variables
-3d-3=0
We move all terms containing d to the left, all other terms to the right
-3d=3
d=3/-3
d=-1
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