25+2k=21

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Solution for 25+2k=21 equation: 



25+2k=21

We move all terms to the left:

25+2k-(21)=0

We add all the numbers together, and all the variables

2k+4=0

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

2k=-4

k=-4/2

k=-2

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