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x in (-oo:+oo)
5-((2/3)*x) = 99 // - 99
5-((2/3)*x)-99 = 0
(-2/3)*x-99+5 = 0
-2/3*x-94 = 0 // + 94
-2/3*x = 94 // : -2/3
x = 94/(-2/3)
x = -141
x = -141
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