154=21+(20-1)d

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Solution for 154=21+(20-1)d equation: 



154=21+(20-1)d

We move all terms to the left:

154-(21+(20-1)d)=0

We add all the numbers together, and all the variables

-(21+19d)+154=0

We get rid of parentheses

-19d-21+154=0

We add all the numbers together, and all the variables

-19d+133=0

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

-19d=-133

d=-133/-19

d=+7

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