Yesterday in class, we worked on equations. We learned how to find out what the variable in the equation was by adding and taking away numbers on both sides. An example of a problem that we did was 7+3x=5x+13. To find out what x is, you have to get x on one side, and the other numbers on the other side.
7+3x=5x+13
-3x -3x Take away 3x on each side to get x on the right side of the = sign.
7=2x+13 This comes out to 7 on one side, and 2x +13 on the other. We have x on one side now, but in order to figure out what it is, you have to take away the 13 on the right side. And whatever you do to one side, you have to do to the other.
7=2x+13 To get the x alone, you have to take away 13.
-13 -13
-6=2x To find out what x is, always divide the number on the side without the x by the number with the x. -6/2= -3. x= -3

Now, you have to check your answer. You do this by inserting the answer that you got for x into the equation wherever you see x.
7+3(-3)=5(-3)+13
-3(-3) -3(-3)
7=2(-3)+13
-13 -13
-6=2(-3)
2*(-3)= -6
X=-3