[SampleMan]

Acceleration of an object (a hammer) due to the gravitational attraction of another object (the moon) is not a function of the first object's (the hammer) mass.

Really, so Jupiter and Earth have the same pull on the sun in your world.

You only did half of the equation.

[DuncanWaring]

...Jupiter and Earth have the same pull on the sun...

No, per the equation, since Jupiter is roughly five times as far from the Sun as Earth and 300 times as massive, the gravitational attraction between Jupiter and the Sun is roughly 12 times that between the Earth and the Sun (300/5²).