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x1+x2=400
x2+x3=446
x1+2x2+x3=846*(-1)
x1+x2+x3-x1-2x2-x3=600-846
-x2=-246
x2=246
x1=400-246=154
x3=446-246=200 x1(ziua1) x2(ziua2 ) x3(ziua3 )