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2013-12-18T19:50:09+02:00
3x+5y=34/ x4
9x+4y=47/x-5
12x+20y=136
-45x-20y=-235
se reduc 20y si -20y
12x-45x=136-235
-33x=-99
x=3
Crizanteme:3x+5y=34
x=3
Atunci 9+5y=34
5y=34-9=25
y=5