-21k+45=280+40k

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Solution for -21k+45=280+40k equation: 



-21k+45=280+40k

We move all terms to the left:

-21k+45-(280+40k)=0

We add all the numbers together, and all the variables

-21k-(40k+280)+45=0

We get rid of parentheses

-21k-40k-280+45=0

We add all the numbers together, and all the variables

-61k-235=0

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

-61k=235

k=235/-61

k=-3+52/61

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