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x-y=-1
x=5-y
x-y=-1
x=5-y
5-y-y=-1
x=5-y
-2y=-1-5
x=5-y
-2y=-6 /: -2
x=5-y
y=3
x=2
y=3
(3*3) - (3*2) = 3
2.3x +3 = y
(3* (-1)) +3 = 0