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19+9d=15+10d
We move all terms to the left:
19+9d-(15+10d)=0
We add all the numbers together, and all the variables
9d-(10d+15)+19=0
We get rid of parentheses
9d-10d-15+19=0
We add all the numbers together, and all the variables
-1d+4=0
We move all terms containing d to the left, all other terms to the right
-d=-4
d=-4/-1
d=+4
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