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x in (-oo:+oo)
4*(1/5) = 3*x // - 3*x
4*(1/5)-(3*x) = 0
4*(1/5)-3*x = 0
4/5-3*x = 0 // - 4/5
-3*x = -4/5 // : -3
x = -4/5/(-3)
x = 4/15
x = 4/15
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