Question

x*(x+6):2- x*(x+14):3-(x 2+1):6=0

Answer 1

(3х^2+18х)/6-(2х^2+28х)/6-(х^2+1)/6=0
3х^2+18х-2х^2-28х-х^2-1=0
-10х=1
Х=-0,1

Проверка
-0,1*5,9/2+0,1*13,9/3-1,01/6=0
-0,295+0,46-0,1683=0
0=0