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10d+5(37-d)=280
We move all terms to the left:
10d+5(37-d)-(280)=0
We add all the numbers together, and all the variables
10d+5(-1d+37)-280=0
We multiply parentheses
10d-5d+185-280=0
We add all the numbers together, and all the variables
5d-95=0
We move all terms containing d to the left, all other terms to the right
5d=95
d=95/5
d=19
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