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(4/5)*x-(1/10) = 3*x+39/50 // - 3*x+39/50
(4/5)*x-(3*x)-(1/10)-(39/50) = 0
(4/5)*x-3*x-1/10-39/50 = 0
-11/5*x-22/25 = 0 // + 22/25
-11/5*x = 22/25 // : -11/5
x = 22/25/(-11/5)
x = -2/5
x = -2/5
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