25=7+k-12

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Solution for 25=7+k-12 equation: 



25=7+k-12

We move all terms to the left:

25-(7+k-12)=0

We add all the numbers together, and all the variables

-(k-5)+25=0

We get rid of parentheses

-k+5+25=0

We add all the numbers together, and all the variables

-1k+30=0

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

-k=-30

k=-30/-1

k=+30

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