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5x + 24y = 43 ×4 20x + 96y = 172
9x + 32y = 69 ×3 27x + 96y = 207 -
-7x = -35
x = -35/-7
x = 5
5x + 24y = 43
5 . 5 + 24y = 43
24y = 43 - 25
y = 18/24
y = 3/4