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(3/10)*x-(4*x)+4/5 = 3/5 // - 3/5
(3/10)*x-(4*x)+4/5-(3/5) = 0
(3/10)*x-4*x+4/5-3/5 = 0
1/5-37/10*x = 0 // - 1/5
-37/10*x = -1/5 // : -37/10
x = -1/5/(-37/10)
x = 2/37
x = 2/37
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