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4.2d-2.2d-1.7+4.3=-1.4
We move all terms to the left:
4.2d-2.2d-1.7+4.3-(-1.4)=0
We add all the numbers together, and all the variables
2d+4=0
We move all terms containing d to the left, all other terms to the right
2d=-4
d=-4/2
d=-2
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