3(X + 3X) < 5(X - 3)
3(4X) < 5X - 15
12X < 5X - 15
12X - 5X < - 15
7X < - 15
X < -15/7
←--------I----------------------------I---------I---------I-------------------→
- ∞ -3 -15/7 -2 0 +∞
Eternamente
꧁axllxa꧂
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3(X + 3X) < 5(X - 3)
3(4X) < 5X - 15
12X < 5X - 15
12X - 5X < - 15
7X < - 15
X < -15/7
←--------I----------------------------I---------I---------I-------------------→
- ∞ -3 -15/7 -2 0 +∞
Eternamente
꧁axllxa꧂