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x1 = x1
n2 = 1
x2 = 8,4
xg = 7,5
(n1+n2) xg = n1 x1 + n2 x2
(5+1)7,5 = 5x1 + 1(8,4)
5x1 = 6(7,5) - 8,4
5x1 = 36,6
x1 = 36,6 : 5
x1 = 7,32