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• How do you solve `-7(x-3) = -4`?
  
• How do you solve the system of equations `-2x + 3y = 3` and `5x - 6y = - 3`?
  
• How do you solve the quadratic using the quadratic formula given `x^2-4x-7=0`?
  
• Question #c32eb
  
• Two objects have masses of `33` `Mg` and `18` `Mg`. How much does the gravitational potential energy between the objects change if the distance between them changes from `81` `m` to `3` `m`?
  
• What is the role of intermolecular forces of attraction?