The sum is a+1*(-5) since you have a multiplication with different signs (+ -).
Multiplication Sign Rules
The rules to multiplication of numbers are:
The result presents a positive sign (+) because the signs are same.
The result presents a negative sign (-) because the signs are different.
The given function is a linear equation with one variable (a). You can rewrite the expression a-5 as a sum. See below.
a+ 1*(-5) =a-5 since when you have a multiplication with different signs (+ -).
Read more about rules for multiplication here:
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