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x in (-oo:+oo)
X+x/3 = 72 // - 72
X+x/3-72 = 0
X+1/3*x-72 = 0 // - X-72
1/3*x = -(X-72) // : 1/3
x = (-(X-72))/1/3
x = 3*(72-X)
x = 3*(72-X)
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