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x in (-oo:+oo)
(-1/4)*x = 9-((2/3)*x) // - 9-((2/3)*x)
(-1/4)*x+(2/3)*x-9 = 0
5/12*x-9 = 0 // + 9
5/12*x = 9 // : 5/12
x = 9/5/12
x = 108/5
x = 108/5
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