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z= 7.7- 2.25
z= 5.45
2.- a+ 2.5= 5.7
a= 5.7- 2.5
a= 3.2
3.- 4.46- b= 2.15
-b= 2.25- 4.46
-b= -2.21
4.- 5.75 + c= 12.82
c= 12.82- 5.75
c= 7.07
5.- 15.45- d= 8
-d= 8- 15.45
-d= -7.45