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-3d-(-13)=4
We move all terms to the left:
-3d-(-13)-(4)=0
determiningTheFunctionDomain -3d-4-(-13)=0
We add all the numbers together, and all the variables
-3d+9=0
We move all terms containing d to the left, all other terms to the right
-3d=-9
d=-9/-3
d=+3
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