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x*[210:15*(20*20-30*10)]=5600

Răspuns :

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Vezi imaginea JOLIEJULIE
X*[210:15*(20*20-30*10)]=5600
X* [14 * (400 - 300)] = 5600
X * [ 14 * 100] = 5600
X * 1400 = 5600
X = 5600 : 1400 
X = 4