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85+d/2=131
We simplify the equation to the form, which is simple to understand
85+d/2=131
We move all terms containing d to the left and all other terms to the right.
+ 0.5d=+131-85
We simplify left and right side of the equation.
+ 0.5d=+46
We divide both sides of the equation by 0.5 to get d.
d=92
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