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x in (-oo:+oo)
6/2.5 = x/3 // - x/3
6/2.5-(x/3) = 0
2.4-1/3*x = 0 // - 2.4
-1/3*x = -2.4 // : -1/3
x = -2.4/(-1/3)
x = 7.20000007
x = 7.20000007
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