Răspuns :
98 457+ 65 137 - c = 79 813
98 457 - c = 79813 - 65 137
- c = 14 676 - 98 457
- c = - 83 781
c = 83 781
98 457 - c = 79813 - 65 137
- c = 14 676 - 98 457
- c = - 83 781
c = 83 781
98457+65137-c=79813
98457+65137=79813+c
163594=79813+c
c=163594-79813
c=83781
98457+65137=79813+c
163594=79813+c
c=163594-79813
c=83781