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25=7+3k=12
We move all terms to the left:
25-(7+3k)=0
We add all the numbers together, and all the variables
-(3k+7)+25=0
We get rid of parentheses
-3k-7+25=0
We add all the numbers together, and all the variables
-3k+18=0
We move all terms containing k to the left, all other terms to the right
-3k=-18
k=-18/-3
k=+6
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