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F2=1
F gab= 16
x1= 7
x gab= 7.125
Dit: X2...?
Jwb:
Xgab=fi.x1+f2.x2/f1+f2
7.125=15.7+1.x2/15+1
7.125=105+x2/16
114=105+x2
x2=114-105
x2=9
Semoga bermanfaat :)