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40=d+-53
We move all terms to the left:
40-(d+-53)=0
We add all the numbers together, and all the variables
-(d-53)+40=0
We get rid of parentheses
-d+53+40=0
We add all the numbers together, and all the variables
-1d+93=0
We move all terms containing d to the left, all other terms to the right
-d=-93
d=-93/-1
d=+93
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