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x in (-oo:+oo)
(-2*x)/5 = 1/4 // - 1/4
(-2*x)/5-(1/4) = 0
(-2*x)/5-1/4 = 0
-2/5*x-1/4 = 0 // + 1/4
-2/5*x = 1/4 // : -2/5
x = 1/4/(-2/5)
x = -5/8
x = -5/8
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