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x in (-oo:+oo)
2.5/4 = x/3.2 // - x/3.2
2.5/4-(x/3.2) = 0
2.5/4-0.3125*x = 0
0.625-0.3125*x = 0 // - 0.625
-0.3125*x = -0.625 // : -0.3125
x = -0.625/(-0.3125)
x = 2
x = 2
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