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0.4*x+x/3 = 0.2*x+6 // - 0.2*x+6
0.4*x+x/3-(0.2*x)-6 = 0
0.4*x+x/3-0.2*x-6 = 0
0.53333333*x-6 = 0 // + 6
0.53333333*x = 6 // : 0.53333333
x = 6/0.53333333
x = 11.25000007
x = 11.25000007
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