Could you write a longer question? Generally, the x means times. Like my hand is seven times bigger than my son's hand. But if it's clothing it means extra-large.
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Assume you mean -7x-2=0 solve for x -7x-2=0 -7x=2 -x=2/7 X=-2/7
If you mean: 7x-2 = 5x+16 then the value of x works out as 9
If you mean: 7x-53 = 9x Then the solution is: x = -26.5
If you mean: 7x+21 = 105 Then the solution is: x = 12
If you mean: 4x squared+7x+4 then the discriminant is -15