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convirtiendo las dos fracciones a un comun denominador ( 21*11 = 231)
x- 77/231 = 21 /231
98 /231 - 77 /231 = 21 /231
21 /231 = 21/231
1/11 = 1/11
x= 98/231 = 14/33
y + 1/2 = -5/20
convirtiendo 1/2 a y/20 = 10/20
y + 10/20 = -5/20
-15/20 + 10/20 = -5/20
-5/20 = -5/20
y = -15/20 = - 3/4
7/6 - z =3/2
convirtiendo 3/2 a x/6 ; 3/2 = 9/6
7/6 - z = 9/6
7/6 - (-2/6) = 9/6
7/6 + 2/6 = 9/6
9/6 = 9/6
z= - 2/6 = -1/3