The formula to find the value of X would be Y-2X. This would equal to y-9 times 2 X.
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(x value) - average
Z = (x-mu)/sigma. So, for your example, any x value can be transformed to Z-score by the formula Z = (x-100)/20.
When an equation cannot be solved for "x" to find the zeroes, the quadratic formula can be used instead for the same purpose.
x is a variable. You do not have to know what its value is. In that equation you have to find the value of x, so if you already know what x stands for then you know the answer
If a number is not less than zero then that is its absolute value. If a number is less than zero, its negative is its absolute value. So, if |x| denotes the absolute value of x, then |x| = -x for x<0 [since if x<0 then -x>0] and |x| = x for x>= 0