Open an example in Overleaf. Information and discussion about LaTeXs math and science related features eg. Begin multline f xy x 7 4x 6y 50x 4y 2 9x 1y 3 - 2x 5y 4 - 2y 2 y 6 end multline Use the equation environment in order to print the equation with the line number.
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For example Emc2 will give Emc2. This is particularly important if the articles contain numerous or complex equations. If we use the align environment and insert an on every line where we wish the equations to be aligned usually at some sort of equality symbol the equations will be aligned. The first one is used to write formulas that are part of a text.