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When you have a minus and a plus sign together, you simply ignore the plus sign. For example -5 + -3 is the same as -5 - 3 which is -8. If you have two minus signs together, you replace them with a plus sign. For example -5 - -3 is the same as -5 + 3 which gives -2. At school I learned a simple rule: 'Minus a minus is a plus'
91
The answer is -8
Zero.
Minus 25 (5x5=25 if there is one minus then the answer is minus).