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x in (-oo:+oo)
1.5 = x/6.5 // - x/6.5
1.5-(x/6.5) = 0
1.5-0.15384615*x = 0
1.5-0.15384615*x = 0 // - 1.5
-0.15384615*x = -1.5 // : -0.15384615
x = -1.5/(-0.15384615)
x = 9.75000024
x = 9.75000024
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