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10x-2y=42
3x-2y=-21
7x=63
x=9
3.9-2y=-21
27-2y=-21
-2y=-48
y=24
5x-y = 21
10x-2y = 42
10x-2y - 3x + 2y = 63
7x = 63
x = 9
y = 45-21 = 24