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x in (-oo:+oo)
-x-(2/5) = x+1/6+4/5 // - x+1/6+4/5
-x-x-(2/5)-(1/6)-(4/5) = 0
-x-x-2/5-1/6-4/5 = 0
-2*x-41/30 = 0 // + 41/30
-2*x = 41/30 // : -2
x = 41/30/(-2)
x = -41/60
x = -41/60
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