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10-0.99d=1+0.89d
We move all terms to the left:
10-0.99d-(1+0.89d)=0
We add all the numbers together, and all the variables
-0.99d-(0.89d+1)+10=0
We get rid of parentheses
-0.99d-0.89d-1+10=0
We add all the numbers together, and all the variables
-1.88d+9=0
We move all terms containing d to the left, all other terms to the right
-1.88d=-9
d=-9/-1.88
d=4+1/1.2702702702703
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