It was invented in 1557 by Welshman Robert Recorde.
The equals sign (=) is usually attributed to Robert Recorde, who introduced it in a treatise on arithmetic called The Whetstone of Witte (1557).
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An expression, or, more pedantically, inequalities.
A mathematical expression has numbers and operation signs with no equal sign. Equations, on the other hand, do contain equal signs.
Multiply each term of the binomial by the monomial. Be particularly careful with signs: (+ times +) or (- times -) equals plus or Like signs = + (+ times -) or (- times +) equals minus or Unlike signs = -
12 signs of the Zodiac
12 = signs of the Zodiac