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0.4d+0.2d=-3.6
We move all terms to the left:
0.4d+0.2d-(-3.6)=0
We add all the numbers together, and all the variables
0.6d+3.6=0
We move all terms containing d to the left, all other terms to the right
0.6d=-3.6
d=-3.6/0.6
d=-6+4.4408920985006E-16/0.6
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