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30+3x[85-(75-65)x a+80] = 519

Răspuns :

Cristinatibulca
3x[8[85-(75-65)x a+80]=519-30
3x[85-(75-65)x a+80]=489
[85-(75-65)x a+80]=489:3
[85-(75-65)x a+80]=163
85-(75-65)x a=163-80
85-(75-65)x a=83
(75-65)x a=85-83
10a=2, a=2/10=1/5
Nitugheorghe57
30+3×[85-(75-65)×a+80]=519⇒
30+3×(85-10×a+80)=519⇒
30+3(165-10a)=519⇒
30+495-30a=519⇒525-30a=519⇒
525-519=30a⇒
6=30a⇒a=6/30⇒a=1/5

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