(2х+7)(3х-1)-(5х-1)(х+3)=(х+1)в квадрате

Question

(2х+7)(3х-1)-(5х-1)(х+3)=(х+1)в квадрате

Answer 1

6x²+21x-2x-7-(5x²-x+15x-3)=x²+2x+1
6x²+21x-2x-7-5x²+x-15x+3=x²+2x+1
6x²-5x²-x²+21x-2x+x-15x-2x=1-3+7
3x=5
x=5/3