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x in (-oo:+oo)
x/12.5 = 0.2 // - 0.2
x/12.5-0.2 = 0
0.08*x-0.2 = 0 // + 0.2
0.08*x = 0.2 // : 0.08
x = 0.2/0.08
x = 2.5
x = 2.5
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