When you have two different signs together (a plus and a minus) the minus takes precedence (the minus "wins").
So, for example, 9 + -3 = 9 - 3 = 6.
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When you are using non-standard definitions of "plus" and "minus", or of "equal".
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Answer : 130
They equal a minus and two +'s or two -'s equal a + :)