Write an equation with a variable on both sides of the equal sign that has infinitely many solutions. solve the equation and explain why it has an infinite number of solutions. i do not understand this at all.. ? : )

 Equation 3(x+3) -x= 2x+3
Essentially the goal is too make the two sides of the equation are equivalent , in my example above when simplified you come out with...
2x+3 = 2x+3
the same thing on both sides, therefor you could plug any value in for x or your variable and it would work

Another Example. 
(y-7)(3)+x = 3y + x -21

When simplified

3y+x-21 = 3y+x -21

They are the same thing, therefor you can plug any value in for y , and this is why you can have an infinite number of solutions

I hope everything makes sense!

The answer would be 27 because assuming that each package has 1 bar of soap and 1 tube of toothpaste, after 27 packages they would run out of toothpaste