Rút gọn (x - 2)(2x + 3) - 2x(x - 3) + x + 7

​rut gon
(x-2)(2x+3)-2x(x-3)+x+7
(x+1)^2-(x-2)(x+2)-(x-1)^2
tim x
​2x(x-5)-x(3+2x)=26
(12x-5).(4x-1)+(3x-7).(1-16x)=81​