A rectangle measuring 3 x 9 would have a perimeter of 24. Note that you really should include units. This could be inches, feet, centimeters, whatever. Numbers such as 3 and 9 and 24 do not tell us what the size actually is, unless we have a unit of measurement.
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3x-6y=9 -3x -3x -6y=9-3x __ ____ -6 -6 y=9-3x ____ -6
3x-9 to = -6
3x+9/2=9 3x=9-9/2 3x=9/2 x=9/6 x=3/2
7x - 9 = 3x + 5 7x - 3x - 9 = 5 7x - 3x = 5 + 9 4x = 14 x = 14/4
(3x - 9 =15) +9 = 3x=(24)/3 = x=8 x=8