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-8 - (-13) = - 8 + 13 = +5 ( minus a minus is a plus)
25 + 16 - 13 - 21 = 7
Seven minus -6 is 13.
One minus fourteen, 1-14 equals -13 read as negative 13.
Since 8 does not equal 13 - 4the equation (8 = 13 - 4) is false and so (8 = 13 - 4) = 0