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x in (-oo:+oo)
x/12 = x/9+1/15 // - x/9+1/15
x/12-(x/9)-(1/15) = 0
x/12-(x/9)-1/15 = 0
-1/36*x-1/15 = 0 // + 1/15
-1/36*x = 1/15 // : -1/36
x = 1/15/(-1/36)
x = -12/5
x = -12/5
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