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50=20(7-1)d
We move all terms to the left:
50-(20(7-1)d)=0
We add all the numbers together, and all the variables
-(206d)+50=0
We add all the numbers together, and all the variables
-206d+50=0
We move all terms containing d to the left, all other terms to the right
-206d=-50
d=-50/-206
d=25/103
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