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x in (-oo:+oo)
(7/8)*(x-((4/7)*x)) = 0
(7/8)*(x+(-4/7)*x) = 0
3/7*7/8*x = 0
( 3/7*x )
3/7*x = 0 // : 3/7
x = 0
( 7/8 )
7/8 = 0
x belongs to the empty set
x = 0
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