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40=15+4.35d
We move all terms to the left:
40-(15+4.35d)=0
We add all the numbers together, and all the variables
-(4.35d+15)+40=0
We get rid of parentheses
-4.35d-15+40=0
We add all the numbers together, and all the variables
-4.35d+25=0
We move all terms containing d to the left, all other terms to the right
-4.35d=-25
d=-25/-4.35
d=5+2.6/3.48
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