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-2=-d/2
We move all terms to the left:
-2-(-d/2)=0
We get rid of parentheses
d/2-2=0
We multiply all the terms by the denominator
d-2*2=0
We add all the numbers together, and all the variables
d-4=0
We move all terms containing d to the left, all other terms to the right
d=4
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