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4%z(16-x)=1,6-x
4%z(16-x)=1,6-x0,04(16-x)=1,6-x0,64-0,04x=1,6-x-0,04x+x=1,6-0,640,96x=0,96 /:0,96x=1
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4%z(16-x)=1,6-x
0,04(16-x)=1,6-x
0,64-0,04x=1,6-x
-0,04x+x=1,6-0,64
0,96x=0,96 /:0,96
x=1