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x in (-oo:+oo)
x-(3/4) = 5*x-(2/5) // - 5*x-(2/5)
x-(5*x)-(3/4)+2/5 = 0
x-5*x-3/4+2/5 = 0
-4*x-7/20 = 0 // + 7/20
-4*x = 7/20 // : -4
x = 7/20/(-4)
x = -7/80
x = -7/80
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