"minus negative x" means "plus x"
(2x - 5)(x + 2) or (2x + 5)(x - 2) depending on what you really meant...
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20x2 - 3x + 10 does not have any real factors.
-10 minus -10 is 0.
10 minus -20 is 30.
-6/10 minus -7/10 is 1/10
negative 4