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□-7+5-3=56 si urmatorul ex□+6+10-30=69 rezolvare

Răspuns :

x-7+5-3=56

x-7+5=56+3=59

x-7=59-5=54

x=54+7=61

x=61

61-7+5-3=56

x+6+10-30=69

x+16=69+30=99

x=99-16=83

x=83

83+6+10-30=69