(3/4-5d)*(3/4+5d)+25d2-15/2d+9/16=0
9/16-25d2+25d2-15/2d+9/16=0
9/8-15/2d=0
9-60d=0
-60d=-9
d=3/20 или 0,15
(3/4-5d)*(3/4+5d)+25d2-15/2d+9/16=0
9/16-25d2+25d2-15/2d+9/16=0
9/8-15/2d=0
9-60d=0
-60d=-9
d=3/20 или 0,15