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7,9 = (30 . 8 - 2 . x2)/(30 - 2)
7,9 = (240 - 2x2)/28
7,9 . 28 = 240 - 2x2
221,2 = 240 - 2x2
2x2 = 240 - 221,2
2x2 = 18,8
x2 = 18,8 : 2
x2 = 9,4