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x in (-oo:+oo)
-9 = 7/2-(x/3) // - 7/2-(x/3)
x/3-(7/2)-9 = 0
x/3-7/2-9 = 0
1/3*x-25/2 = 0 // + 25/2
1/3*x = 25/2 // : 1/3
x = 25/2/1/3
x = 75/2
x = 75/2
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