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x in (-oo:+oo)
5 = x/12.5 // - x/12.5
5-(x/12.5) = 0
5-0.08*x = 0
5-0.08*x = 0 // - 5
-0.08*x = -5 // : -0.08
x = -5/(-0.08)
x = 62.5
x = 62.5
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