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6,5 = 8+20+6x+35+16+27 / (16+x)
6,5 = 106 + 6x / (16+x)
106+6x = 6,5 (16+x)
106+6x = 104 + 6,5x
106-104 = 6,5x - 6x
2 = 0,5x
x = 2/0,5
x = 4