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x in (-oo:+oo)
x/2-(2/5) = (4*x)/5-(1/6) // - (4*x)/5-(1/6)
x/2-((4*x)/5)-(2/5)+1/6 = 0
x/2+(-4/5)*x-2/5+1/6 = 0
-3/10*x-7/30 = 0 // + 7/30
-3/10*x = 7/30 // : -3/10
x = 7/30/(-3/10)
x = -7/9
x = -7/9
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