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x in (-oo:+oo)
(-1*x)/4 = 9 // - 9
(-1*x)/4-9 = 0
-x/4-9 = 0
-1/4*x-9 = 0 // + 9
-1/4*x = 9 // : -1/4
x = 9/(-1/4)
x = -36
x = -36
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