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2.5d+9.75=1+4.2
We move all terms to the left:
2.5d+9.75-(1+4.2)=0
We add all the numbers together, and all the variables
2.5d+9.75-(5.2)=0
We add all the numbers together, and all the variables
2.5d+4.55=0
We move all terms containing d to the left, all other terms to the right
2.5d=-4.55
d=-4.55/2.5
d=-1+1/1.219512195122
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