It's very easy if you don't align things (e.g. try to keep the = in multiple assignments in the same column) and use a fixed width (1 tabstop?) for continuation

It's very easy if you don't align things (e.g. try to keep the = in multiple assignments in the same column) and use a fixed width (1 tabstop?) for continuation lines. Or, if you are typesetting a book, you can do alignment in the typesetting software instead of adding spaces.