Respuesta :

18=2(5+y)
18=10+2y
18-10=2y
8=2y
y=4
Multiply 2 by everything in parenthesis

2 times 5 is 10
2 times y is 2y

Now 2y+10=18 ( solve for y)

Subtract 10 from 18 =8

Then divide 8 by 2=4

Y=4
RELAXING NOICE
Relax