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10(9+d)=210
We simplify the equation to the form, which is simple to understand
10(9+d)=210
Reorder the terms in parentheses
+(+90+10d)=210
Remove unnecessary parentheses
+90+10d=+210
We move all terms containing d to the left and all other terms to the right.
+10d=+210-90
We simplify left and right side of the equation.
+10d=+120
We divide both sides of the equation by 10 to get d.
d=12
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