The idea is to:
* Replace "x" by "4" in -2x
* Do the calculations
* Take the absolute value
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|x + 1| - |x + 4| = 0 ∴ |x + 1| = |x + 4| ∴ x + 1 = -x - 4 ∴ 2x = -5 ∴ x = -5/2
If you mean: 4 = 2x then the value of x = 2
If you mean: -2x = -4 then the value of x is 2
x = 4
The value of X in the equation 2x plus 36 = 4 is -16.