Okay, here we have this:
| x/4+3|<6
Applying the properties of absolute values:
-6x/4+3>-6 and x/4+3<6
x/4>-6-3 and x/4<6-3
x/4>-9 and x/4<3
x>-36 and x<12
Mixing the overlapping intervals:
-36
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