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15+deschidem paranteza x+2 Închidem paranteza +21 egal 47

Răspuns :

15+(x+2)+21=47
15+(x+2)=47-21=26
x+2=26-15=11
x=11-2
x=9
15+(x+2)+21=47
15+(x+2)=47-21
15+(x+2)=26
x+2=26-15
x+2=11
x=11-2
x=9.