21=-2k+3

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Solution for 21=-2k+3 equation: 



21=-2k+3

We move all terms to the left:

21-(-2k+3)=0

We get rid of parentheses

2k-3+21=0

We add all the numbers together, and all the variables

2k+18=0

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

2k=-18

k=-18/2

k=-9

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