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x*((14*x-70)/(-5)) = 0
(x*(14*x-70))/(-5) = 0
( 14*x-70 )
14*x-70 = 0 // + 70
14*x = 70 // : 14
x = 70/14
x = 5
( x )
x = 0
x in { 5, 0 }
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