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-2(5d-15)=5d+15
We move all terms to the left:
-2(5d-15)-(5d+15)=0
We multiply parentheses
-10d-(5d+15)+30=0
We get rid of parentheses
-10d-5d-15+30=0
We add all the numbers together, and all the variables
-15d+15=0
We move all terms containing d to the left, all other terms to the right
-15d=-15
d=-15/-15
d=1
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