Question

va rog frumos repede day coronita​

Answer 1

(2x-15) | 15 ∈N  ⇒2x-15 divide pe 15 adica 2x-15=D15={1,3,5,15}

2x-15=1 ⇒x=16:2=8

2x-15=3 ⇒x=18:2=9

2x-15=5 ⇒x=20:2=10

2x-15=15⇒x=30:2=15

A={8,9,10,15}

y=8+9+10+15=42 lei