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A mathematical expression has numbers and operation signs with no equal sign. Equations, on the other hand, do contain equal signs.
There can be no answer to the question because it is based on a false proposition. You can have as many equal signs in a line: either as sequential equalities or as simultaneous ones.
They equal a minus and two +'s or two -'s equal a + :)
Expressions never have equality signs
All expressions DO contain equals signs.