10X^2-(2X-3)(5X-1)=31

Question

10X^2-(2X-3)(5X-1)=31

Answer 1

          10x^2-10x^2-3+17x=31 17x=34   x=2

Answer 2

10x^2-(10x^2-2x-15x+3)=31

2x+15x-3-31=0

17x=34

x=2

Ответ:2