47631, 47613, 47361, 47316, 47163, 47136, 46731, 46713, 46371, 46317, 46173, 46137, 43761, 43716, 43671, 43617, 43176, 43167, 41763, 41736, 41673, 41637, 41376, 41367, 37641, 37614, 37461, 37416, 37164, 37146, 36741, 36714, 36471, 36417, 36174, 36147, 34761, 34716, 34671, 34617, 34176, 34167, 31764, 31746, 31674, 31647, 31476, 31467, 17643, 17634, 17463, 17436, 17364, 17346, 16743, 16734, 16473, 16437, 16374, 16347, 14763, 14736, 14673, 14637, 14376, 14367, 13764, 13746, 13674, 13647, 13476, 13467.
4х-7а=х^2
x^2-4x+7a=0
D=(-4)^2-4*7a=4(4-7a)>0
4-7a>0
4>7a
a<4/7
х=0
4*0-7а=0^2
0=7a
a=0<4/7
x=1
4*1-7a=1^2
4-1=7a
3=7a
a=3/7<4/7