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0.3*x-((2/5)*(x-3)) = (1/5)*x-6 // - (1/5)*x-6
0.3*x-((2/5)*(x-3))-((1/5)*x)+6 = 0
(-2/5)*(x-3)+0.3*x+(-1/5)*x+6 = 0
0.3*x-2/5*(x-3)-x/5+6 = 0
(-2/5*5*(x-3))/5+(0.3*5*x)/5-x/5+(5*6)/5 = 0
0.3*5*x-2/5*5*(x-3)-x+5*6 = 0
6-0.5*x-x+30 = 0
6-1.5*x+30 = 0
36-1.5*x = 0
(36-1.5*x)/5 = 0
(36-1.5*x)/5 = 0 // * 5
36-1.5*x = 0
36-1.5*x = 0 // - 36
-1.5*x = -36 // : -1.5
x = -36/(-1.5)
x = 24
x = 24
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