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x in (-oo:+oo)
(-1/4)*x-1 = -9 // + 9
(-1/4)*x-1+9 = 0
8-1/4*x = 0 // - 8
-1/4*x = -8 // : -1/4
x = -8/(-1/4)
x = 32
x = 32
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