49=9+(6-1)d

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Solution for 49=9+(6-1)d equation: 



49=9+(6-1)d

We move all terms to the left:

49-(9+(6-1)d)=0

We add all the numbers together, and all the variables

-(9+5d)+49=0

We get rid of parentheses

-5d-9+49=0

We add all the numbers together, and all the variables

-5d+40=0

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

-5d=-40

d=-40/-5

d=+8

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