Let's say you've got a see-saw (teeter-totter)... and you've got 50 pounds of stuff piled on each side:
Here's the big Algebra game:
Whatever you do, you've got to
What if we add 3 pounds to the left side?
CLUNK! It's not balanced anymore!
But, if we add 3 pounds to BOTH sides?
It stays balanced!
Equations are just like see-saws...
You have to keep them balanced!
So, whatever you do to one side of the " = " you've got to do to the other side!
You'll see what it's all about in the next few lessons.