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78.5=3.14d
We simplify the equation to the form, which is simple to understand
78.5=3.14d
We move all terms containing d to the left and all other terms to the right.
-3.14d=-78.5
We simplify left and right side of the equation.
-3.14d=-78.5
We divide both sides of the equation by -03.14 to get d.
d=25
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