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An Iraqi guy invented it to help people who are having trouble figuring out negatives, positives and zeros
A posistive from this is that you are able to lose weight but a negetive is not being able to eat your favourite meats.
When you have 2 positives you add them.
= What are the positives and the negatives of the primary source? =
Positive: Provides transportation Negatives: Pollutes air Must pay when broken Must pay for tires Leads to deaths