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rezolvati in multimea nr naturale ecuatiile 8 (x +3) +7=71

Răspuns :

8 (x+3) +7=71
8(x+3) =71-7
8(x+3) =64
x+3 =64:8
x+3=8
x=8-3
x=5
8(x+3)+7=71
8x+24+7=72
8x+31=71
8x=71-31
8x=40
x=40:8
x=5