Expression: 3a, x + 4, 2x - 7y, 5(x + 2), Equation: 2x = 10, 9x - 4 = 23, 3 + d = 10 - d, 60/v = 12, Formula: P = 2l + 2w, C = 2 x pi x r, A = 1/2bh, S = D/T, Identity: 3 (x+4) ≡ 3x+12, 1 + x ≡ x + 1, 5 x q = q x 5, 2 (z+6) ≡ 2z+12, Inequality: −1 ≤ x < 4, 5a − 4 > 2a + 8, 2x - 7 > x + 7 , x > 12,

Distinguishing between expressions, equations, formulae, identities and inequalities

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