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x in (-oo:+oo)
x/(-4) = 1+9 // - 1+9
x/(-4)-9-1 = 0
-1/4*x-10 = 0 // + 10
-1/4*x = 10 // : -1/4
x = 10/(-1/4)
x = -40
x = -40
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