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x=+3×[+3×(-8+6-4)+15]+21+(-7+9)​

Răspuns :

Răspuns:

x=3×[3×(-2-4)+15]+21+2

x=3×[3×(-6)+15]+21+2

x=3×(-18+15)+23

x=3×(-3)+23

x=-9+23

x=14