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x in (-oo:+oo)
-x/3-5 = 2*x // - 2*x
-x/3-(2*x)-5 = 0
-x/3-2*x-5 = 0
-7/3*x-5 = 0 // + 5
-7/3*x = 5 // : -7/3
x = 5/(-7/3)
x = -15/7
x = -15/7
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