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300-d/40=140
We move all terms to the left:
300-d/40-(140)=0
We add all the numbers together, and all the variables
-d/40+160=0
We multiply all the terms by the denominator
-d+160*40=0
We add all the numbers together, and all the variables
-1d+6400=0
We move all terms containing d to the left, all other terms to the right
-d=-6400
d=-6400/-1
d=+6400
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