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2.1d=-51.24
We move all terms to the left:
2.1d-(-51.24)=0
We add all the numbers together, and all the variables
2.1d+51.24=0
We move all terms containing d to the left, all other terms to the right
2.1d=-51.24
d=-51.24/2.1
d=-24+0.84/2.1
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