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x in (-oo:+oo)
4-((2/3)*x) = -9 // + 9
4-((2/3)*x)+9 = 0
(-2/3)*x+4+9 = 0
13-2/3*x = 0 // - 13
-2/3*x = -13 // : -2/3
x = -13/(-2/3)
x = 39/2
x = 39/2
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