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x-y=40
x+y=180
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Răspuns :

x-y=40 ⇒ x=y+40
x+y=180
y+40+y=180
y+y=180-40
2y=140
y=140:2
y=70
x=70+40
x=110
V: 110+70=180
     110-70= 40