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(-2/7)*(1-(4*x)) = 0
(-2/7)*(1-4*x) = 0
-2/7*(1-4*x) = 0
( -2/7 )
-2/7 = 0
x belongs to the empty set
( 1-4*x )
1-4*x = 0 // - 1
-4*x = -1 // : -4
x = -1/(-4)
x = 1/4
x = 1/4
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