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soalnya kalau kita masukkan 3 ke x, maka
3 + x = 6, 3 + 3 = 6 (benar)
2x + 4 = 10, 2 x 3 + 4 = 10, 6 + 4 = 10 (benar)
3x - 9 = 0, 3 x 3 - 9 = 0, 9 - 9 = 0 (benar)
3x + 2 = 8, 3 x 3 + 2 = 8, 9 + 2 = 8 (salah)