Respuesta :

r=-6. edjnowf viichbhsdbawihv
dbutterworth

Answer:

r = -6

Step-by-step explanation:

6r+7=13+7r

subtract 6r from both sides. 7r-6r= 1r or r

subtract 13 from both sides. 7-13= -6

left with -6=r or r=-6

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