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(1/3)*x-(7*x)+5/9 = -20/9 // + -20/9
(1/3)*x-(7*x)+5/9-(-20/9) = 0
(1/3)*x-7*x+5/9+20/9 = 0
25/9-20/3*x = 0 // - 25/9
-20/3*x = -25/9 // : -20/3
x = -25/9/(-20/3)
x = 5/12
x = 5/12
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