Evaluate : `6/7-2+(-7)/9+(19)/(21)`

47-2+-(7)/(9)+(11)/(21)

Evaluate the sum: 2/(7)+6/(9)

Evaluate: (5)/(4)-(7)/(6)-(-(2)/9)

Subtract: 2/7\ from\ (19)/(21)

(7)/(9)=(21)/(dots)

Evaluate: a. (9)/(5) - ((6)/(7) div (10)/(21))

Evaluate: [9+(7-8)]-[(21+6)-(22-15)]

Subtract: 2/7 from (19)/(21)

Express each of the following as a rational number of the form (p)/(q):(-8)/(3)+(-1)/(4)+(-11)/(6)+(3)/(8)-3( ii) (6)/(7)+1+(-7)/(9)+(19)/(21)+(-12)/(7)

Express each of the following as a rational number of the form p/q :\ (-8)/3+(-1)/4+(-11)/6+3/8-3 (ii) 6/7+1+(-7)/9+(19)/(21)+(-12)/7