Respuesta :

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5m + 3m = ?   m = 120-12

So, we simply solve for m first.

m = 108

So, plug in 108 for m.
5m + 3m = ?

5(108) + 3(108) = ?

Simplify.

540 + 324 = ?

Simplify once more.

864

~Hope I helped!~