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x in (-oo:+oo)
-(4*(-5/9))-12 = x // - x
-x-(4*(-5/9))-12 = 0
20/9-x-12 = 0
-x-88/9 = 0 // + 88/9
-x = 88/9 // * -1
x = -88/9
x = -88/9
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