Question

[Tống Ngọc Hà Vy]

Tìm xx, biết: \left(x+2\right)+\left(x+5\right)+\left(x+8\right)+\left(x+11\right)+...+\left(x+53\right)=585(x+2)+(x+5)+(x+8)+(x+11)+...+(x+53)=585

x=x= .