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x in (-oo:+oo)
40-x = x/3+4 // - x/3+4
40-x-(x/3)-4 = 0
36-4/3*x = 0 // - 36
-4/3*x = -36 // : -4/3
x = -36/(-4/3)
x = 27
x = 27
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