A variable like "x" can have any value. If you have a complete equation, like 9x + 12 = 100, a specific value of x will make the equation true; other values will make it false. But here, you don't have an equation, so any value will do for x.
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-9x-25=3 -9x=28 9x=-28 x=-28/9
9x + 2 = 12x + 14 -3x = 12 x = -4
9x+6 = 7x+18 9x-7x = 18-6 2x = 12 x = 6
6x + 47 = 9x + 11 6x + 36 = 9x 36 = 3x 12 = x
In this equation, x=6.