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50+1.99d=3.99d
We simplify the equation to the form, which is simple to understand
50+1.99d=3.99d
We move all terms containing d to the left and all other terms to the right.
+1.99d-3.99d=-50
We simplify left and right side of the equation.
-2d=-50
We divide both sides of the equation by -2 to get d.
d=25
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