Solving with 6=a and 7= b will for 2a+3b = 12 + 21= 33, however 5x6, all by itself already equals 30, with the next step in simplifying being multiplying by 7.
The transitive property is not applicable when changing the functions.
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-5ab + 7ab -9ab + ab -2ab ... Let's simplify that a bit:ab(-5+7-9+1-2) = -8ab
In any sum a + b = c, the numbers represented by a and b are called addends or summands. Occasionally, the number represented by a is called an augend.
The sum of two "V"s (Fives) are represented by one "X" (Ten), and the sum of two "L"s (Fifty) are represented by one "C" (Hundred).
A sum is used to compare two or more numbers - a single number cannot have a sum.
You cannot. The sum of negative integers will be negative.