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10+d=15+1/2d
We simplify the equation to the form, which is simple to understand
10+d=15+1/2d
We move all terms containing d to the left and all other terms to the right.
+1d-2d=+15-10
We simplify left and right side of the equation.
-1d=+5
We divide both sides of the equation by -1 to get d.
d=-5
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