solve (5-a)/2+(5-c)/4=0,2*i=b -a, (a-5)% 2F2% 2B (bc)% 2F2% 3D0, (cb)% 2F2% 2B (c-5)% 2F4% 2B (cd)% 2F3% 3D0,% 20 (dc)% 2F3% 2Bd% 2F (0.5 * 10 * raíz (-1))% 3D0, (cd)% 2F3% 3Di