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-2(d-9.7)=1.4
We move all terms to the left:
-2(d-9.7)-(1.4)=0
We add all the numbers together, and all the variables
-2(d-9.7)-1.4=0
We multiply parentheses
-2d+19.4-1.4=0
We add all the numbers together, and all the variables
-2d+18=0
We move all terms containing d to the left, all other terms to the right
-2d=-18
d=-18/-2
d=+9
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