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x in (-oo:+oo)
2-((1/3)*x) = 15 // - 15
2-((1/3)*x)-15 = 0
(-1/3)*x-15+2 = 0
-1/3*x-13 = 0 // + 13
-1/3*x = 13 // : -1/3
x = 13/(-1/3)
x = -39
x = -39
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