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5%x+8%*3 = 6%(x+3)
0,05x+0,08*3 = 0,06(x+3)
0,05x+0,24 = 0,06x+0,18
0,05x-0,06x = 0,18-0,24
-0,01x = -0,06 |:(-0,01)
x = 6 [kg]
5%x + 8%*3 = 6% (x+3)
0.05x + 0.08 * 3 = 0.06 (x+3)
0.05x + 0.24 = 0.06x + 0.18
0.05x - 0.06x = 0.18 - 0.24
-0.01x = 0.06 | / ( -0.01 )
x = 6