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OpenStudy (rayep12):
7−(−19)−18+(−19)+18
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OpenStudy (abbles):
7 will be the answer. The -18 and +18 cancel out (18 - 18 = 0). Same with the -19 and the +19 (you get +19 from the two negatives). That leaves you with 7. Do you understand?
OpenStudy (lord_box):
Well, you had a 7, then did 2 things to it, then undid 2 things to it, so... you still have 7.
OpenStudy (rayep12):
yea
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