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That has three sides. We solve for x in the middle side:
-7 < 3 - 2x < 13
Add -3 to all three sides to cancel
away the 3 in the middle
-7 < 3 - 2x < 13
-3 -3 -3
------------------
-10 < -2x < 10
Now we divide all three sides by -2.
But we must remember that when we divide
by a negative number, the symbols reverse:
-10 -2x 10
----- > ----- > ----
-2 -2 -2
5 > x > -5
And that is the same thing as
-5 < x < 5
Sometimes that is written as (-5, 5),
called "interval notation".
Edwin
