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(5-2d)=7
We move all terms to the left:
(5-2d)-(7)=0
We add all the numbers together, and all the variables
(-2d+5)-7=0
We get rid of parentheses
-2d+5-7=0
We add all the numbers together, and all the variables
-2d-2=0
We move all terms containing d to the left, all other terms to the right
-2d=2
d=2/-2
d=-1
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