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x in (-oo:+oo)
2*(5-((3/4)*x)) = 0
2*((-3/4)*x+5) = 0
2*(5-3/4*x) = 0
( 2 )
2 = 0
x belongs to the empty set
( 5-3/4*x )
5-3/4*x = 0 // - 5
-3/4*x = -5 // : -3/4
x = -5/(-3/4)
x = 20/3
x = 20/3
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