3(d-87)=21

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Solution for 3(d-87)=21 equation: 



3(d-87)=21

We move all terms to the left:

3(d-87)-(21)=0

We multiply parentheses

3d-261-21=0

We add all the numbers together, and all the variables

3d-282=0

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

3d=282

d=282/3

d=94

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