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d/2-30=10
We move all terms to the left:
d/2-30-(10)=0
We add all the numbers together, and all the variables
d/2-40=0
We multiply all the terms by the denominator
d-40*2=0
We add all the numbers together, and all the variables
d-80=0
We move all terms containing d to the left, all other terms to the right
d=80
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