Which one of the following equations is NOT equivalent to ?

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Problem

Which one of the following equations is NOT equivalent to 5x+4=195x + 4 = 19? (a) 15x+12=5715x + 12 = 57 (b) x=3x = 3 (c) 6x+4=206x + 4 = 20 (d) 5x=19−45x = 19 - 4

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