Question

12(4x−5) 52=10
What number can go for x to make the solution true?
x=
5, 12, 8, or 20

Answer 1

12(4x-5)52=10

Say x=5. Replace the x with 5.
12(4*5-5)52=?
12(20-5)52=?
12(15)52=?
180*52=9360
x does not equal 5

Now lets try 12.
12(4*12-5)52=?
12(48-5)52=?
12(43)52=?
516*52=26832
x does not equal 12

Repeat this process with the other two numbers. Just replace x with one of the numbers. Make sure there is no negative signs on any of the numbers. All signs are crucial.
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