7(3+5k)-21=210

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Solution for 7(3+5k)-21=210 equation: 



7(3+5k)-21=210

We move all terms to the left:

7(3+5k)-21-(210)=0

We add all the numbers together, and all the variables

7(5k+3)-21-210=0

We add all the numbers together, and all the variables

7(5k+3)-231=0

We multiply parentheses

35k+21-231=0

We add all the numbers together, and all the variables

35k-210=0

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

35k=210

k=210/35

k=6

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