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Aflati nr nat x din egalitatea 4×[20+60:(125-7×15)]+x=100.

Răspuns :

4x[20 +60:(125 - 105)]+x=100
4x[20 +60:20]+x=100
4x(20+3)+x=100
4x23+x=100
92+x=100
x=100-92
x=8