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.99-10d=0.89-d
We move all terms to the left:
.99-10d-(0.89-d)=0
We add all the numbers together, and all the variables
-10d-(-1d+0.89)+.99=0
We add all the numbers together, and all the variables
-10d-(-1d+0.89)+0.99=0
We get rid of parentheses
-10d+1d-0.89+0.99=0
We add all the numbers together, and all the variables
-9d+0.1=0
We move all terms containing d to the left, all other terms to the right
-9d=-0.1
d=-0.1/-9
d=0.1/9
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