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a fost răspuns

(3n+140):((28+49:7):(58-17×3))=40

Răspuns :

(3n+140) : ( 35:7)=40
(3n+140):5=40
3n+140=40x5
3n+140=200
3n=200-140
3n=60
n=60:3
n=20
(3n+140):(35:7)=40
(3n+140):5=40
3n+140=200
3n=60
n=20