Question 881461
(x+3)(3x+5)-(7)=0 
7 is not  a factor
3x^2+14x+15-7=0
3x^2+14x+8=0
Now you want factors of 24 (3*8) which add up to 14
12 and 2
3x^2+12x+2x+8=0
3x(x+4)+2(x+4)=0
(3x+2)*(x+4)=0
now set the factors to 0
3x+2=0
3x=-2
x=-/3
x+4=0
x=-4
 *[invoke change_this_name4450 3, 14, 8, "x"]