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The solution of the equation |x| + 4*x = 18 has to be determined.
|x| + 4*x = 18
If there is a negative solution of x, |x| = -x
=> -x + 4x = 18
=> 3x = 18
=> x = 6
As x = 6 is not negative there are no negative solutions.
For positive values of x, |x| = x
=> x + 4x = 18
=> 5x = 18
=> x = 3.6
The solution of the equation is x = 3.6
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