Expression: 2x + 3 , 3z, 5x - 5, 7h + 2, 5a3 - 4, x + 2x, x + 5, x/2 +x, 12 - 13t, s - 5, Equation: x + 5 = 8, y - 20 = 2, 3h - 1 = 5k, x - 2y = 7, 2r + 17 = 30, 3x + 9 = 26, k2 + 1 = 6, 6p + 4q = 9, 3x - 2y = 21, 3n + 1 = 6n,

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