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x in (-oo:+oo)
((15*x)/76)*(x+100) = 0
15/76*x*(x+100) = 0
( 15/76*x )
15/76*x = 0 // : 15/76
x = 0
( x+100 )
x+100 = 0 // - 100
x = -100
x in { 0, -100 }
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