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x in (-oo:+oo)
x = (2/5)*t-4 // - (2/5)*t-4
x-((2/5)*t)+4 = 0
(-2/5)*t+x+4 = 0
x-2/5*t+4 = 0 // - 4-2/5*t
x = -(4-2/5*t)
x = -(4-2/5*t)
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