The tutor

Tangi bent over a math worksheet, its light on the line under 3x = 15, where it writes x = 15 ÷ 3
A math worksheet under Tangi's light: 3x + 5 = 20, then 3x = 15, and x = 15 ÷ 3 lit in blue

It reads the real page and draws on it with light.

Tangi, a white desk-lamp robot, its head lighting a sheet of paper on the desk

The light stays on the page as the sheet moves and turns.

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