All you have to do for this one is look at it, and ask yourself: "What number
could it be, if three times as much is the same as five times as much ?"
The only possible value for 'x' is zero.
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23
172=x
5x+y=-7 3x+y=15 8=D
3x + 4 = 5x - 6 -3x -3x 4 = 2x - 6 +6 +6 10 = 2x 5 = x
5x - 5 = 3x - 9 add 5 to both sides: 5x =3x -4 subtract 3x from both sides: 2x = -4 Divide both sides by 2: x = -2