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80+3d=550
We simplify the equation to the form, which is simple to understand
80+3d=550
We move all terms containing d to the left and all other terms to the right.
+3d=+550-80
We simplify left and right side of the equation.
+3d=+470
We divide both sides of the equation by 3 to get d.
d=156.66666666667
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