Answer the ask prompt to modify the last line to be your answer. "Add line" adds a new line, "remove last line" remove the last one. "Calculate" figures out the numerical value (evaluates) of a mathematical expression without variables, such as "5 + (3 - 8) * 7". "Solve" solves a number of equations (such as "x2 + 5 = 25") to get the value of all variables involved.
Credit to @DadOfMrLog for his x^y custom block! Algebra does not yet work with a number of things such as exponents, operators with the same variable on both sides (like x+x = 20), or multiple variables in the same equation (like x + y = y / 2).
