12n+17=8n+21 - combine variables on one side, 12n-8n =4n - inverse operations; combine variables, 4n+17=21 - get variable alone, 21-17 =4 - inverse operations; move the Constant, 4n=4 - inverse operations; move the Coefficient, n=1 - solution, 12 (1) + 17 = 8(1) +21 - check your work,

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