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1/4(12+d)=13
We simplify the equation to the form, which is simple to understand
1/4(12+d)=13
Reorder the terms in parentheses
+(+3 + 0.25d)=13
Remove unnecessary parentheses
+3 + 0.25d=+13
We move all terms containing d to the left and all other terms to the right.
+ 0.25d=+13-3
We simplify left and right side of the equation.
+ 0.25d=+10
We divide both sides of the equation by 0.25 to get d.
d=40
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