Hi,

-5+(3-7)-a = 8-11

-5+ 1*(3-7) -a = 8-11

Removing parenthesis

-5+ 3-7 -a = 8-11

combining like terms

-9 - a = -3

isoating a on one side the equation by adding a and 3 to both sides of the equation

-6 = a 

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