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x in (-oo:+oo)
-4*x-(2/5) = 38/5 // - 38/5
-4*x-(2/5)-(38/5) = 0
-4*x-2/5-38/5 = 0
-4*x-8 = 0 // + 8
-4*x = 8 // : -4
x = 8/(-4)
x = -2
x = -2
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