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Determina numarul natural "a" pentru care are loc egalitatea :[15x(10xa-11)-120]x10-125=25

Răspuns :

[15x(10xa-11)-120]x10-125=25

(150a-165-120)x10-125=25

(150a-285)x10=125+25

1500a-2850=150

1500a=150+2850

1500a=3000

a=3000:1500

a=2