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x in (-oo:+oo)
4*t = x/5-u // - x/5-u
4*t+u-(x/5) = 0
4*t+u-1/5*x = 0 // - 4*t+u
-1/5*x = -(4*t+u) // : -1/5
x = (-(4*t+u))/(-1/5)
x = 5*(4*t+u)
x = 5*(4*t+u)
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