x + 3 = 9, , 2x + 6 = 4, , x – 4 = 7, , 2x – 3 = 5, x = 7, x + 8 = 15, x = 4, 3x – 5 = 7, x = 3, x + 4 = 7, x = 6, x – 1 = 5, x = 1, 2x + 1 = 3, , 4x + 5 = 13.

Solve Algebraic Expression Using Bar Models

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