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daca x+y+z=25+z atunci 50+x+25+y=? ​

Răspuns :

x+y+z=25+z/-z

x+y+z-z=25+z-z

x+y=25

50+x+25+y=50+25+x+y=75+25=100

Explicație pas cu pas:

x+y+z=25+z

x+y=25

50+x+25+y=50+25+x+y=50+25+25=100