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(4/5)*x = (1/10)*x+2/5 // - (1/10)*x+2/5
(4/5)*x-((1/10)*x)-(2/5) = 0
(4/5)*x+(-1/10)*x-2/5 = 0
7/10*x-2/5 = 0 // + 2/5
7/10*x = 2/5 // : 7/10
x = 2/5/7/10
x = 4/7
x = 4/7
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