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x in (-oo:+oo)
6/8 = (9*x)/20 // - (9*x)/20
6/8-((9*x)/20) = 0
(-9/20)*x+6/8 = 0
3/4-9/20*x = 0 // - 3/4
-9/20*x = -3/4 // : -9/20
x = -3/4/(-9/20)
x = 5/3
x = 5/3
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