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Subtracting equations is just another way to say subtracting equations with variables in them.
Like for example if we have the equation "y-4=15" with the variable y which is a lower-case letter.
To solve this we have to add since it is the opposite of subtraction and we have to add the +4 like this:
y-4=15
+4   +4
Now we are left with 15+4 since the 4's since -4+4 cut each other out like this:
y-4=15  =   15
+4   +4     + 4
-----
y      =        19

So now we have a statement that says 15+4=19 and that y=19 and to find out if this is true we have to put our answer into the previous equation like this:

19-4=15
y=19

So this statement is true.
Now try some of these and make sure to watch the video on YouTube.

Sheet 1 Subtracting Equations

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