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d.5.20=2.40
We move all terms to the left:
d.5.20-(2.40)=0
We add all the numbers together, and all the variables
d.5.20-(2.4)=0
We add all the numbers together, and all the variables
d.5.20-2.4=0
We move all terms containing d to the left, all other terms to the right
d.5.20=2.4
d=2.4/1
d=2.4
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