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x in (-oo:+oo)
(2/5)*x-(4/9) = -6 // + 6
(2/5)*x-(4/9)+6 = 0
(2/5)*x-4/9+6 = 0
2/5*x+50/9 = 0 // - 50/9
2/5*x = -50/9 // : 2/5
x = -50/9/2/5
x = -125/9
x = -125/9
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