Question 822582
7x-(2x-1)=x^2-5-(x+1)
7x-2x+1=x^2-5-x-1
5x+1=x^2-x-6
x^2-6x-7=0
(x-7)*(x+1)=0
x=7
father is 49
son is 14-1=13
check
49-5=44
8=13-5
ok