Ответ:
а) 12х+19-7с-у=12х+19-7с+у (нет)
b) 33-7u+8v=33-7u+8u(да)
c)41b-5:d-12+n=41b-5:d-12-n(нет)
d)c+3a-7-m=с+3а-7-m(да)
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Ответ:
а) 12х+19-7с-у=12х+19-7с+у (нет)
b) 33-7u+8v=33-7u+8u(да)
c)41b-5:d-12+n=41b-5:d-12-n(нет)
d)c+3a-7-m=с+3а-7-m(да)