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X1=65
n1= 26
n2=4
Xgab= (X1.n1)+(X2.n2) : n1+n2
Xgab= (65x26)+(X2x4) :6+4
63= 1690 + 4X2 : 30
1890 = 1690 +4X2
1890-1690 =4X2
200:4=X2
50=X2
?=((26+4)x63)-(26x65) / 4
?=1890-1690 /4
?=200/4=50