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x+y=3 /*(-1)
x-2y=5
-x-y=-3
3y=2 /:3
y=1,5
x+1,5=3
x=1,5
y=1,5
x+y=3 *-1
-x-y=-3
x-2y=5
------------------ +
-3y=2 /-3
x-2y=5
y=2/3
x= 5 4/3