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2*420-(60/2)+3*60-(80/2) = 0
3*60-(60/2)-(80/2)+840 = 0
3*60-(80/2)-30+840 = 0
3*60-(80/2)+810 = 0
180-(80/2)+810 = 0
990-(80/2) = 0
990-40 = 0
950 = 0
L <> R
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