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x in (-oo:+oo)
7/6 = x/7.5 // - x/7.5
7/6-(x/7.5) = 0
7/6-0.13333333*x = 0
7/6-0.13333333*x = 0 // - 7/6
-0.13333333*x = -7/6 // : -0.13333333
x = -7/6/(-0.13333333)
x = 8.75000024
x = 8.75000024
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