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1200=1.10d+2.50d
We simplify the equation to the form, which is simple to understand
1200=1.10d+2.50d
We move all terms containing d to the left and all other terms to the right.
-1.1d-2.5d=-1200
We simplify left and right side of the equation.
-3.6d=-1200
We divide both sides of the equation by -3.6 to get d.
d=333.33333333333
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