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x in (-oo:+oo)
X-72 = (1/5)*x // - (1/5)*x
X-((1/5)*x)-72 = 0
X+(-1/5)*x-72 = 0
X-1/5*x-72 = 0 // - X-72
-1/5*x = -(X-72) // : -1/5
x = (-(X-72))/(-1/5)
x = -5*(72-X)
x = -5*(72-X)
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