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15=-3+5k
We move all terms to the left:
15-(-3+5k)=0
We add all the numbers together, and all the variables
-(5k-3)+15=0
We get rid of parentheses
-5k+3+15=0
We add all the numbers together, and all the variables
-5k+18=0
We move all terms containing k to the left, all other terms to the right
-5k=-18
k=-18/-5
k=3+3/5
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