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78.9=d-4.56
We move all terms to the left:
78.9-(d-4.56)=0
We get rid of parentheses
-d+4.56+78.9=0
We add all the numbers together, and all the variables
-1d+83.46=0
We move all terms containing d to the left, all other terms to the right
-d=-83.46
d=-83.46/-1
d=83+0.45999999999999/1
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