👤

∈ ce inseamna si 2(x+5)=18 va rog ajutatima


Răspuns :

apartine
2(x + 5) = 18
2x + 10 = 18
2x = 18-10
2x = 8
x = 8 : 2
x = 4
∈- apartine
x∈N
2(x+5)=18
x+5=9 x=4
Sau
2(x+5)=18
2x+10=18
2x=8
x=4
x∈N