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x in (-oo:+oo)
100/30 = (4/3)*x // - (4/3)*x
100/30-((4/3)*x) = 0
(-4/3)*x+100/30 = 0
10/3-4/3*x = 0 // - 10/3
-4/3*x = -10/3 // : -4/3
x = -10/3/(-4/3)
x = 5/2
x = 5/2
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