Respuesta :

-7(-7)-5y=54 
49 - 5y = 54
49 - 54 = 5y
5y = -5
y = -1
-7(-7)-5y=54
multiply the -7s the negatives cancel out
49-5y=54
subtract 49 from both sides
-5y=5
divide by -5
y=-1

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