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If you have 1 - (-9) take the lines and make them into addition sign.
Like this 1 + 9 witch is 10.
If you have 1 + (-9) then it makes it subtraction
so it would be 1 - -9 witch is -10
If you have -1 X 7 then it would be -7
If you had -1 X -7 the it would be 7
If you have -8 / 2 witch is -4
if you had -8 / -2 then it would be 4
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