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FLORINADIANA20005
a fost răspuns

3*{10+2*[40-2*(28-3*5)]}-7x=51

Răspuns :

CarMina03
3*{10+2*[40-2*(28-3*5)]}-7x=51

3*{10+2*[40-2*(28-15)]}-7x=51

3*{10+2*[40-2*13]}-7x=51

3*{10+2*[40-26]}-7x=51

3*(10+2*14)-7x=51

3*(10+28)-7x=51

3*38-7x=51

114-7x=51

7x=114-51

7x=63

x=63:7

x=9
Corneadiana23
3*{10+2*[40-2*(28-15)]}-7x=51
3*{10+2*[40-2*13]}-7x=51
3*{10+2*[40-26]}-7x=51
3*{10+2*14}-7x=51
3*{10+28}-7x=51
3*38-7x=51
114-51=7x
63=7x
x=63/7
x=9

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