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80d+30=20d+50
We simplify the equation to the form, which is simple to understand
80d+30=20d+50
We move all terms containing d to the left and all other terms to the right.
+80d-20d=+50-30
We simplify left and right side of the equation.
+60d=+20
We divide both sides of the equation by 60 to get d.
d=0.33333333333333
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