Answer:
y^2
Explanation:
One way of doing this problem is to multiply both numerator and denominator by y^7. Doing this we get:
y^(-2+7)
--------------- = y^2
y^(-7+7)
y^5
y^-2/y^-7
When we divide exponents with the same base, we subtract the exponents
y^ ( -2 - -7)
y^ ( -2+7)
y^ 5
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