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Afla termenul necunoscut 25+a-20+32=48

Răspuns :

Se face cu mersul invers:
25+a-20=48-32
25+a-20=16
 25+a=16+20
25+a=36
a=36-25
a=11


                                                                                         R:11



                                                          COROANA?




25+a-20+33=48
a-20+33=23