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5(2d-1)+10d+25(2d-4)=455
We simplify the equation to the form, which is simple to understand
5(2d-1)+10d+25(2d-4)=455
Reorder the terms in parentheses
+(+10d-5)+10d+25*(2d-4)=455
Remove unnecessary parentheses
+10d-5+10d+25+*(+2d-4+)=+455
Reorder the terms in parentheses
+10d-5+10d+(+50d-100)=455
Remove unnecessary parentheses
+10d-5+10d+50d-100=+455
We move all terms containing d to the left and all other terms to the right.
+10d+10d+50d=+455+5+100
We simplify left and right side of the equation.
+70d=+560
We divide both sides of the equation by 70 to get d.
d=8
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