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2r-28+2r -28-2r=
-28+2r-28=
2r-56
2r - 28 + 2r - 28 - 2r
Agrupamos por términos semejantes:
2r + 2r - 2r - 28 - 28
4r - 2r - 28 - 28
2r - 56 → respuesta