0,5x+0,1x+0,2x+6=x
0,8x+6=x
0,2x=6/*5
x=30
0.5x+0.1x+0.2x+6=x
6=x-0.2x-0.5x-0.1x
6=0,2x/*5
0.5*30+0.1*30+0.2*30+6=30
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0,5x+0,1x+0,2x+6=x
0,8x+6=x
0,2x=6/*5
x=30
0.5x+0.1x+0.2x+6=x
6=x-0.2x-0.5x-0.1x
6=0,2x/*5
x=30
0.5*30+0.1*30+0.2*30+6=30