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h in (-oo:+oo)
((20*h)/7)*(h-7) = 0
20/7*h*(h-7) = 0
( 20/7*h )
20/7*h = 0 // : 20/7
h = 0
( h-7 )
h-7 = 0 // + 7
h = 7
h in { 0, 7 }
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