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x in (-oo:+oo)
abs(18-(x/4)) = 4 // - 4
abs(18-(x/4))-4 = 0
abs(18-(x/4))-4 = 0
x in (-oo:+oo)
abs(18-(x/4))
18-(x/4) >= 0
18-1/4*x >= 0 // - 18
-1/4*x >= -18 // : -1/4
x <= -18/(-1/4)
x <= 72
x in (-oo:72>
18-(x/4)-4 = 0
x in (72:+oo)
x/4-18-4 = 0
abs(18-(x/4))-4 = 0
/ | 18-(x/4)-4 = 0 i x in (-oo:72> | x/4-18-4 = 0 i x in (72:+oo)
x in (-oo:72>
18-(x/4)-4 = 0
14-1/4*x = 0 // - 14
-1/4*x = -14 // : -1/4
x = -14/(-1/4)
x = 56
x in (72:+oo)
x/4-18-4 = 0
1/4*x-22 = 0 // + 22
1/4*x = 22 // : 1/4
x = 22/1/4
x = 88
x in { 56, 88 }
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