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Aflati nr natural x din egalitatea 4.[20+60:(125-7.15)]+x =100

Răspuns :

4×[20+60:(125-7×15)]+x =100
4×[20+60:(125-105)]+x =100
4×(20+60:20)+x =100
4×(20+3)+x =100
4×23+x =100
92+x =100
x=8