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------- = --------- ⇒ x = -------------- = 12
4 16 4
15 6 6 * 30
------- = ----------- ⇒ x = -------------- = 12
30 x 15
4 20 4 * 75
------ = ----------- ⇒ x = --------------- = 15
x 75 20
x 25 4 * 25
------ = --------- ⇒ x = ------------------ = 10
4 10 10