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x in (-oo:+oo)
100/2 = 3*x // - 3*x
100/2-(3*x) = 0
100/2-3*x = 0
50-3*x = 0 // - 50
-3*x = -50 // : -3
x = -50/(-3)
x = 50/3
x = 50/3
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