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x in (-oo:+oo)
(1/5)*(4-(3*x)) = 0
(1/5)*(4-3*x) = 0
1/5*(4-3*x) = 0
4-3*x = 0 // - 4
-3*x = -4 // : -3
x = -4/(-3)
x = 4/3
x = 4/3
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