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-2d-15-19d=-20d+2
We move all terms to the left:
-2d-15-19d-(-20d+2)=0
We add all the numbers together, and all the variables
-21d-(-20d+2)-15=0
We get rid of parentheses
-21d+20d-2-15=0
We add all the numbers together, and all the variables
-1d-17=0
We move all terms containing d to the left, all other terms to the right
-d=17
d=17/-1
d=-17
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