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60=5\left(k+1\right)+3\left(k+5\right)
Multiply both sides of the equation by 15, the least common multiple of 3,5.
60=5k+5+3\left(k+5\right)
Use the distributive property to multiply 5 by k+1.
60=5k+5+3k+15
Use the distributive property to multiply 3 by k+5.
60=8k+5+15
Combine 5k and 3k to get 8k.
60=8k+20
Add 5 and 15 to get 20.
8k+20=60
Swap sides so that all variable terms are on the left hand side.
8k=60-20
Subtract 20 from both sides.
8k=40
Subtract 20 from 60 to get 40.
k=\frac{40}{8}
Divide both sides by 8.
k=5
Divide 40 by 8 to get 5.