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4d+5.25=49.21
We move all terms to the left:
4d+5.25-(49.21)=0
We add all the numbers together, and all the variables
4d-43.96=0
We move all terms containing d to the left, all other terms to the right
4d=43.96
d=43.96/4
d=10+2.0204081632653/2.0408163265306
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