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(1/3)*x-(1/9) = -4*x // + -4*x
(1/3)*x-(-4*x)-(1/9) = 0
(1/3)*x+4*x-1/9 = 0
13/3*x-1/9 = 0 // + 1/9
13/3*x = 1/9 // : 13/3
x = 1/9/13/3
x = 1/39
x = 1/39
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