Equation: equal sign and single unknown (usually), solve, 2x + 4 = 6 - 4x, Expression: several unknowns; no equal sign, substitute values OR simplify, 2a + 3(a + b), Formula: equal sign and several unknowns; single letter on l.h.s, substitute values OR rearrange, A = ∏r2, Identity: several unknowns; equal sign, test values OR prove correct, 2(L + W) = 2L + 2W,

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