![\dfrac{21y^{-6}}{-7y^{-6}}= (-3) *y^{-6 -[-6]} = (-3)*y^{6+6}=-3*y^{0} = -3*1 = -3](/tpl/images/2519/3535/5149c.png)
211-0 + (-71-9)
.
Simplify
0 0
-3,12
-3
0 -3
DONE
...
Answers: 3
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