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1000+(d*3)=1021
We move all terms to the left:
1000+(d*3)-(1021)=0
We add all the numbers together, and all the variables
(+d*3)+1000-1021=0
We add all the numbers together, and all the variables
(+d*3)-21=0
We get rid of parentheses
d*3-21=0
Wy multiply elements
3d-21=0
We move all terms containing d to the left, all other terms to the right
3d=21
d=21/3
d=7
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