NicolasTsarkozy
2021-02-14 00:54:34
a + b = 8
a + c = 13
b + d = 8
c - d = 6
d = c - 6
b + c - 6 = 8
b + c = 14
b = 14 - c
a + 14 - c = 8
a + c = 13
a - c = - 6
a + c = 13
2a = 7
a = 3,5
a + b = 8
b = 8 - 3,5
b = 4,5
a + c = 13
c = 13 - 3,5
c = 9,5
c - d = 6
d = c - 6
d = 9,5 - 6
d = 3,5