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2y=5-2
2y=3
y=3/2
y=1,5
1+2y=5
2y=5-1
2y=4
y=4/2
y=2
-2+2y=5
2y=5+2
2y=7
y=7/2
y=3,5
-1+2y=5
2y=5+1
2y=6
y=6/2
y=3