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-2(d-99)=98
We move all terms to the left:
-2(d-99)-(98)=0
We multiply parentheses
-2d+198-98=0
We add all the numbers together, and all the variables
-2d+100=0
We move all terms containing d to the left, all other terms to the right
-2d=-100
d=-100/-2
d=+50
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