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x in (-oo:+oo)
(-2/5)*x = -18/5 // + -18/5
(-2/5)*x-(-18/5) = 0
(-2/5)*x+18/5 = 0
18/5-2/5*x = 0 // - 18/5
-2/5*x = -18/5 // : -2/5
x = -18/5/(-2/5)
x = 9
x = 9
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