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x in (-oo:+oo)
20 = (4/3)*x-23 // - (4/3)*x-23
20-((4/3)*x)+23 = 0
(-4/3)*x+20+23 = 0
43-4/3*x = 0 // - 43
-4/3*x = -43 // : -4/3
x = -43/(-4/3)
x = 129/4
x = 129/4
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