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x in (-oo:+oo)
7/6 = x/7.8 // - x/7.8
7/6-(x/7.8) = 0
7/6-0.12820513*x = 0
7/6-0.12820513*x = 0 // - 7/6
-0.12820513*x = -7/6 // : -0.12820513
x = -7/6/(-0.12820513)
x = 9.0999999
x = 9.0999999
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