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x in (-oo:+oo)
4-((2/3)*x) = 5 // - 5
4-((2/3)*x)-5 = 0
(-2/3)*x-5+4 = 0
-2/3*x-1 = 0 // + 1
-2/3*x = 1 // : -2/3
x = 1/(-2/3)
x = -3/2
x = -3/2
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