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x in (-oo:+oo)
x/(-2) = 9/10 // - 9/10
x/(-2)-(9/10) = 0
x/(-2)-9/10 = 0
-1/2*x-9/10 = 0 // + 9/10
-1/2*x = 9/10 // : -1/2
x = 9/10/(-1/2)
x = -9/5
x = -9/5
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