20+(7-1)d=50

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Solution for 20+(7-1)d=50 equation: 



20+(7-1)d=50

We move all terms to the left:

20+(7-1)d-(50)=0

We add all the numbers together, and all the variables

6d+20-50=0

We add all the numbers together, and all the variables

6d-30=0

We move all terms containing d to the left, all other terms to the right

6d=30

d=30/6

d=5

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