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x in (-oo:+oo)
1/3-((7/3)*x) = -9 // + 9
1/3-((7/3)*x)+9 = 0
(-7/3)*x+1/3+9 = 0
28/3-7/3*x = 0 // - 28/3
-7/3*x = -28/3 // : -7/3
x = -28/3/(-7/3)
x = 4
x = 4
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