Meagan M. answered 04/13/19
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"A number" is x.
"3 times a number" is 3x.
So 3x - 3 (three subtracted from three times a number) is -36.
3x - 3 = -36
3x - 3 + 3 = -36 + 3
3x = -33
3x/3 = -33/3
x = -11
Hope this helps!