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0,25x+y=7
x=16
1/4*16+y=7
x=16
y=3
spr. 1/2*16-1/4*16=4
1/4*16+3=7
0.25x+y=7
0.25x=4
0.25x+y=7
4+y=7
y=7-4
y=3
x=4*4=16
spr: 4+3=7