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70.2-0.4d=90
We move all terms to the left:
70.2-0.4d-(90)=0
We add all the numbers together, and all the variables
-0.4d-19.8=0
We move all terms containing d to the left, all other terms to the right
-0.4d=19.8
d=19.8/-0.4
d=-49+0.2/0.4
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