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-52 (Negative X Negative = Positive) (Negative X Positive = Negative)
(+)13 does NOT equal (-13). However, their modulii (plural of modulus) are equal at '13' . It is written as as a value -13 < +13 However the modulii is written as |-13| = |+13| note the use of vertical lines, because the numerical value is the same.
positive 169
The value of the positive number is greater than the value of the negative number. 23 + (-13) = 10 but (-23) + 13 = (-10)
7-(-13) also equals: 7+13. Because, if you look at it, you can see that -(- can look like a positive. This is because taking negative from a negative can be considered adding! Isn't this unique?