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Easy Infinity Mirror With Arduino Gemma & NeoPixels
Digital DiceView Instructable »
What were the test variables that you used? If you used A = 1, B = -3, and C=2 like I did in step 4 then you should get 2 and 1 for the answers.
It moves the X= to the right side of the screen (check out the last picture). Its not necessary, just a personal preference.