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x in (-oo:+oo)
1-((9/6)*x) = 2/5 // - 2/5
1-((9/6)*x)-(2/5) = 0
(-3/2)*x-2/5+1 = 0
3/5-3/2*x = 0 // - 3/5
-3/2*x = -3/5 // : -3/2
x = -3/5/(-3/2)
x = 2/5
x = 2/5
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