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.
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
All expressions DO contain equals signs.