Solve 2x = 10, x = 10, x = 5, x = 2, Don't Know, Solve 3x = 12, x = 12, x = 6, x = 4, Don't Know, Solve 3x = 18, x = 18, x = 12, x = 6, x = 5, Don't Know, Solve 5x + 4 = 19, x = 3, x = 5, x = 2, x = 7, Don't Know, Solve 5x - 4 = 21, x = 5, x = 3, x = 4, Don't Know.

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