2y-3)(3y+1)+2(y-5)(y+5)=2(1-2y)²+6y
6y^2+2y-9y-3+2(y^2+5y-5y-25)=2(1-4y+4y^2)+6y
6y^2-7y-3+2y^2-50
=2-8y+8y^2+6y
8y^2-8y^2-55=5y
-55=5y
y=-11
5/15=1/3
13/26=1/2
15/40=3/8
24/32=3/4
1/3=8/24
1/2=12/24
3/8=9/24
3/4=18/24
475 32 1680 480 32 25 110 340
8 9/8 + 2 18/11 - 3 1/4 = 73/8 + 40/11 - 13/4 =(73 × 11 + 40 × 8 - 13 × 22)/88 = 803/88 + 320/88 - 286/88 = 837/88 = 9 45/88