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

Răspuns :

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