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help me please with this
Simplify.

5a-12a


Sagot :

It helps to imagine the variable a sort of as a unit. Like with 5 minus 12 lemons, it has no bearings on the addition/subtraction here.

Factor out a and subtract.

[tex]5a-12a \\ (5-12)a \\ \boxed{-7a}[/tex]