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2x - y = 3
2x - y = 3
2(- y + 3) - y = 3
-2y + 6 - y = 3
-2y - y = 3 - 6
-3y = -3
y = 1
x + y = 3
x + 1 = 3
x = 3 - 1
x = 2
x = 3 - y
2x - y = 3
2 ( 3 - y ) - y = 3
6 - 2y -y = 3
6 - 3y = 3
-3y = 3 - 6
-3y = -3
y = -3 : -3
y = 1
x = 3 - y
x = 3 - 1
x = 2
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