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afla numarul necunoscut : x-236489+124561=489678

Răspuns :

x-236489+124561=489678
x-236489=489678-124561
x-236489=365117
x=365117+236489
x=601606
x-236489+124561=489678
x-236489=489678-124561
x-236489=365117
x=365117+236489
x=601606