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x in (-oo:+oo)
(-1/9)*(x-18) = 6 // - 6
(-1/9)*(x-18)-6 = 0
-1/9*(x-18)-6 = 0
-1/9*(x-18)-6 = 0
-1/9*x-4 = 0
-1/9*x-4 = 0
-1/9*x-4 = 0 // + 4
-1/9*x = 4 // : -1/9
x = 4/(-1/9)
x = -36
x = -36
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