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13=2-d/9
We simplify the equation to the form, which is simple to understand
13=2-d/9
Simplifying:
13=2-0.111111111111d
We move all terms containing d to the left and all other terms to the right.
+ 0.111111111111d=+2-13
We simplify left and right side of the equation.
+ 0.111111111111d=-11
We divide both sides of the equation by 00.111111111111 to get d.
d=-99.0000000001
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