For Graphing Reversible Keyboard Pen-Touch Operation Equation Editor Shift/Change Graph Slide Show Rapid Graph/Window/Zoom For WriteView / Standard WriteView Direct Algebraic Logic (D.A.L.) Multi-Line Playback Constant/Chain Calculations Numerical Derivative/Integral Formula Memory Solver Function Matrix Function Resume Function Definable Memory
		This function enables calculation of a variable X in a given equation. Other variables (a, b, c, etc.) must already be defined in order to calculate X.