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x in (-oo:+oo)
5/2.5 = x/7.5 // - x/7.5
5/2.5-(x/7.5) = 0
5/2.5-0.13333333*x = 0
2-0.13333333*x = 0 // - 2
-0.13333333*x = -2 // : -0.13333333
x = -2/(-0.13333333)
x = 15.00000038
x = 15.00000038
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