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x in (-oo:+oo)
(-5/2)*x = (1/2)*x+1/5 // - (1/2)*x+1/5
(-5/2)*x-((1/2)*x)-(1/5) = 0
(-5/2)*x+(-1/2)*x-1/5 = 0
-3*x-1/5 = 0 // + 1/5
-3*x = 1/5 // : -3
x = 1/5/(-3)
x = -1/15
x = -1/15
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