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y=sqrt{2} - sqrt{2}
x+2y=3
y=0
x+2 mnożone 0=3
y=0
x+0=3
y=0
x=3
y=0
y+√2=√2 / · (-2)
2y+x=3
-2y=0
+_____
x=3
2y+3=3
2y=0
y=0
Pozdrawiam, jak czegoś nie rozumiesz to pytaj ;)