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x in (-oo:+oo)
(1/5)*x-(4/9) = 0
(1/5)*x-4/9 = 0
1/5*x-4/9 = 0 // + 4/9
1/5*x = 4/9 // : 1/5
x = 4/9/1/5
x = 20/9
x = 20/9
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