a)1/3a + 1/a=4/3a
1/3a - 1/a=-2/3a
b)3/3-y - y/y^2-9=-4y+9/y^2-9
3/3-y + y/y^2-9=-2y+9/y^2-9
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B) -(4y+9/y^2-9)
a)1/3a + 1/a=4/3a
1/3a - 1/a=-2/3a
b)3/3-y - y/y^2-9=-4y+9/y^2-9
3/3-y + y/y^2-9=-2y+9/y^2-9