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210=(9+d)*10
We simplify the equation to the form, which is simple to understand
210=(9+d)*10
Reorder the terms in parentheses
210=(+90+10d)
Remove unnecessary parentheses
210=+90+10d
We move all terms containing d to the left and all other terms to the right.
-10d=+90-210
We simplify left and right side of the equation.
-10d=-120
We divide both sides of the equation by -010 to get d.
d=12
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