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(4/10)*x-(4*x)+8/5 = 4/5 // - 4/5
(4/10)*x-(4*x)+8/5-(4/5) = 0
(4/10)*x-4*x+8/5-4/5 = 0
4/5-18/5*x = 0 // - 4/5
-18/5*x = -4/5 // : -18/5
x = -4/5/(-18/5)
x = 2/9
x = 2/9
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