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2x-7 =
you want to isolate x so you need to first
add 7 to both sides
2x - 7 + 7 = + 7
-7 and + 7 cancel each other out so you get
2x = 7
which is the same as
2 * x = 7
to move the 2 over to the other side you have to divide both sides by 2
(2 / 2) * x = (7/2)
2 divided by 2 equals 1 and anything multiplied by 1 equals itself you're left with
x = 7/2
or
x = 3.5
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