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x in (-oo:+oo)
1-((2/3)*x) = -15 // + 15
1-((2/3)*x)+15 = 0
(-2/3)*x+1+15 = 0
16-2/3*x = 0 // - 16
-2/3*x = -16 // : -2/3
x = -16/(-2/3)
x = 24
x = 24
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