rational expressions

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1)Can z+6/z+1 be reduced any further?

2)Add and simplify
(v/v^2+8v+16) + (4/v^2+7v+12)

3)For this second binomial do you change the the sign of the second term?
Subtract and simplify
(1-y/y-2) - (9y-8/2-y)


4)Solve
(4/5)+(1/2)=(1/x)


5)(8/x)=(9/x)-(1/2)

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