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(x-3/7x-6/35x)-(x-3/7x-6/35x)*40%=630
(x-15/35x-6/35x)-(x-15/35x-6/35x)*40%=630
14/35x-14/35x*0,4=630
2/5x-4/25x=630
10/25x-4/25x=630
6/25x=630
0,24x=630
24x=63000
x=2625[zł]