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50=5+.5d
We simplify the equation to the form, which is simple to understand
50=5+.5d
We move all terms containing d to the left and all other terms to the right.
-0.5d=+5-50
We simplify left and right side of the equation.
-0.5d=-45
We divide both sides of the equation by -00.5 to get d.
d=90
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