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25=7+2k-12+k
We move all terms to the left:
25-(7+2k-12+k)=0
We add all the numbers together, and all the variables
-(3k-5)+25=0
We get rid of parentheses
-3k+5+25=0
We add all the numbers together, and all the variables
-3k+30=0
We move all terms containing k to the left, all other terms to the right
-3k=-30
k=-30/-3
k=+10
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