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x in (-oo:+oo)
4 = x/2.5 // - x/2.5
4-(x/2.5) = 0
4-0.4*x = 0
4-0.4*x = 0 // - 4
-0.4*x = -4 // : -0.4
x = -4/(-0.4)
x = 10
x = 10
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