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REzOLVATI in multimea N Ecuatia 3x + 1 = 10: 3x+1 =10 3x=10-1 3x=9 x=9:8 x=3∈N 3·3+1=10 (A) 10=10 Urgent! va rog frumos!

Răspuns :

3X+1=10
3X=10-1
3X=9
X=9/3
X=3∈N

3×3+1=10
9+1=10 (A)