2x + 3y + 14; x = 1, y = 2 - 39, 4ab + 15; a=2, b = 3 - 22, 5j - k + 1; j=2, k=1 - 10, 9 + (12 - 5) + 4 - 20, 10 - 5 + (20 - 6) - 19,

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