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