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10d+15=20
We simplify the equation to the form, which is simple to understand
10d+15=20
We move all terms containing d to the left and all other terms to the right.
+10d=+20-15
We simplify left and right side of the equation.
+10d=+5
We divide both sides of the equation by 10 to get d.
d=0.5
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