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x in (-oo:+oo)
8.5 = x/5 // - x/5
8.5-(x/5) = 0
8.5-1/5*x = 0 // - 8.5
-1/5*x = -8.5 // : -1/5
x = -8.5/(-1/5)
x = 42.5
x = 42.5
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