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x in (-oo:+oo)
9-((2/3)*x) = -1 // + 1
1-((2/3)*x)+9 = 0
(-2/3)*x+1+9 = 0
10-2/3*x = 0 // - 10
-2/3*x = -10 // : -2/3
x = -10/(-2/3)
x = 15
x = 15
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