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x in (-oo:+oo)
(2/5)*x-((2/5)*(x-3)) = (1/5)*x+3 // - (1/5)*x+3
(2/5)*x-((2/5)*(x-3))-((1/5)*x)-3 = 0
(-2/5)*(x-3)+(2/5)*x+(-1/5)*x-3 = 0
(2*x)/5-2/5*(x-3)-x/5-3 = 0
(-2/5*5*(x-3))/5+(2*x)/5-x/5+(-3*5)/5 = 0
2*x-2/5*5*(x-3)-x-3*5 = 0
6-x-15 = 0
-x-9 = 0
(-x-9)/5 = 0
(-x-9)/5 = 0 // * 5
-x-9 = 0
-x-9 = 0 // + 9
-x = 9 // * -1
x = -9
x = -9
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