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x in (-oo:+oo)
x-(x/2)-(2/3)-12 = 5*x-(40/4) // - 5*x-(40/4)
x-(x/2)-(5*x)-(2/3)+40/4-12 = 0
x-(x/2)-5*x-2/3+40/4-12 = 0
-9/2*x-8/3 = 0 // + 8/3
-9/2*x = 8/3 // : -9/2
x = 8/3/(-9/2)
x = -16/27
x = -16/27
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