I don’t know how correctly write numbers with signs in a calculated question.
For example, I need print a line equation y={k}x+{b}, where {b} in the range from -9 to 9.
If b<0, the text will be written in the form y=2x+–3.
If I omit the sign "+" in the text (y={k}x{b}), there is no sign for the positive values of b.