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  • https://math.libretexts.org/Courses/Grayson_College/Prealgebra/Book%3A_Prealgebra_(OpenStax)/03%3A_Integers/3.12%3A_Integers_(Summary)
    The number that is the same distance from zero on the number line, but on the opposite side of zero. −a means the opposite of the number a The notation −a is read the opposite of a. When the signs are...The number that is the same distance from zero on the number line, but on the opposite side of zero. −a means the opposite of the number a The notation −a is read the opposite of a. When the signs are the same, the counters would be all the same color, so add them. For any numbers a, b, c, if a = b then a − c = b − c. For any numbers a, b, c, if a = b then a + c = b + c. For any numbers a, b, c, and c ≠ 0 If a = b, then ac=bc.

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