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10(d)+5(d+2)=115
We simplify the equation to the form, which is simple to understand
10(d)+5(d+2)=115
Reorder the terms in parentheses
+(+10d)+5*(d+2)=115
Remove unnecessary parentheses
+10d+5+*(+d+2+)=+115
Reorder the terms in parentheses
+10d+(+5d+10)=115
Remove unnecessary parentheses
+10d+5d+10=+115
We move all terms containing d to the left and all other terms to the right.
+10d+5d=+115-10
We simplify left and right side of the equation.
+15d=+105
We divide both sides of the equation by 15 to get d.
d=7
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