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Gasiti numarul natural x care verifica egalitatea
A) 3+x egal 8
B) X+19 egal 20


Răspuns :

3+x=8
x=8-3
x=5
x+19=20
x=20-19
x=1
A) 3+x=8/-3 X=5 B) x+19=20/-19 X=1