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-19d+15=6-20d+5
We move all terms to the left:
-19d+15-(6-20d+5)=0
We add all the numbers together, and all the variables
-19d-(-20d+11)+15=0
We get rid of parentheses
-19d+20d-11+15=0
We add all the numbers together, and all the variables
d+4=0
We move all terms containing d to the left, all other terms to the right
d=-4
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