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x in (-oo:+oo)
0.3/1.2 = x/5 // - x/5
0.3/1.2-(x/5) = 0
0.25-1/5*x = 0 // - 0.25
-1/5*x = -0.25 // : -1/5
x = -0.25/(-1/5)
x = 1.25
x = 1.25
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