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X/0.4 = 2.5*x // - 2.5*x
X/0.4-(2.5*x) = 0
X/0.4-2.5*x = 0
2.5*X-2.5*x = 0 // - 2.5*X
-2.5*x = -(2.5*X) // : -2.5
x = (-(2.5*X))/(-2.5)
x = X
x = X
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