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-4 = x+7 /6
a. given
-24=n+7 sym prop of =
-17 =n add prop =
b. given
2=n+7. add prop of =
-5=n. subt prop of =
c. given
-24=n+7. Div prop of =
-31=n sub prop of =
d. given
-24+ n+7. div prop of =
-31=n. add prop of =