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2x-y=3
x=5-y
2x-y=3
x=5-y
2(5-y)-y=3
x=5-y
10-2y-y=3
x=5-y
10-3y=3 /-10
x=5-y
-3y=3-10
x=5-y
-3y=-7 /:(-3)
x=5-y
y=7/3
x=5-7/3=5-2 i 1/3=2 i 2/3
y=7/3