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AFLATI NUMARUL x STIIND CA : 2 * {12 + 3 * [ 60 - 3 *(27-4*3)]}-5x = 64

Răspuns :

2 × { 12 + 3 × [ 60 - 3 × ( 27 - 4 × 3 ) ] } - 5 x = 64

2 × { 12  + 3 × [ 60 - 3 × ( 27 - 12 ) ] } - 5 x = 64

2 × [ 12 + 3 × ( 60 - 3 × 15 ) ] - 5 x = 64

2 × ( 12 + 3 × 15 ) - 5 x = 64

2 × ( 12 + 45 ) - 5 x = 64

2 × 57 - 5 x = 64

114 - 5 x = 64

5 x = 114 - 64

5 x = 50

x = 50 : 5

x = 10 → numarul