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21(11d-9)=15(15d-14)
We simplify the equation to the form, which is simple to understand
21(11d-9)=15(15d-14)
Reorder the terms in parentheses
+(+231d-189)=15*(15d-14)
Remove unnecessary parentheses
+231d-189=+15+*(+15d-14+)
Reorder the terms in parentheses
+231d-189=+(+225d-210)
Remove unnecessary parentheses
+231d-189=+225d-210
We move all terms containing d to the left and all other terms to the right.
+231d-225d=-210+189
We simplify left and right side of the equation.
+6d=-21
We divide both sides of the equation by 6 to get d.
d=-3.5
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