{"type":"rich","version":"1.0","title":"c / ( a + b ) = 1 ⇒ a + b = c","html":"<iframe src=\"https://www.desmos.com/calculator/a7mo8kaeg0?embed\" width=\"500px\" height=\"500px\" style=\"border: 1px solid #ccc\" frameborder=0></iframe>","width":500,"height":500}