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.99d=10.00+.89d
We move all terms to the left:
.99d-(10.00+.89d)=0
We add all the numbers together, and all the variables
.99d-(.89d+10)=0
We get rid of parentheses
.99d-.89d-10=0
We add all the numbers together, and all the variables
0.1d-10=0
We move all terms containing d to the left, all other terms to the right
0.1d=10
d=10/0.1
d=100
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