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.99d=10d+.89
We move all terms to the left:
.99d-(10d+.89)=0
We add all the numbers together, and all the variables
.99d-(10d+0.89)=0
We get rid of parentheses
.99d-10d-0.89=0
We add all the numbers together, and all the variables
-9.01d-0.89=0
We move all terms containing d to the left, all other terms to the right
-9.01d=0.89
d=0.89/-9.01
d=-0.89/9.01
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