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2(2d+5)=15
We simplify the equation to the form, which is simple to understand
2(2d+5)=15
Reorder the terms in parentheses
+(+4d+10)=15
Remove unnecessary parentheses
+4d+10=+15
We move all terms containing d to the left and all other terms to the right.
+4d=+15-10
We simplify left and right side of the equation.
+4d=+5
We divide both sides of the equation by 4 to get d.
d=1.25
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