Allow me to suggest a clearer layout

3X - 7 = 26

. : 3X = 26 + 7 = 33

. : X = 33/3 = 11

check 3 * 11= 33 - 7 = 26

3X - 7 = 26

. : 3X = 26 + 7 = 33

. : X = 33/3 = 11

check 3 * 11= 33 - 7 = 26

3X - 7 = 26

. : 3X = 26 + 7 = 33

. : X = 33/3 = 11

check 3 * 11= 33 - 7 = 26

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