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