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-2(d+1.4)-1.4)-1.8=20.6
We move all terms to the left:
-2(d+1.4)-1.4)-1.8-(20.6)=0
We add all the numbers together, and all the variables
-2(d+1.4)=0
We multiply parentheses
-2d-2.8=0
We move all terms containing d to the left, all other terms to the right
-2d=2.8
d=2.8/-2
d=-1+0.8/2
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