UPSKILL MATH PLUS

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Say true or false.
 
1. The expressions \(8x + 3y\) and \(7x + 2y\) can not be added.
 
2. If \(x\) is a natural number, then \(x + 1\) is its predecessor.
 
3. Sum of \(a - b + c\) and \(-a + b - c\) is zero.