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x in (-oo:+oo)
X+(7/5)*x = 72 // - 72
X+(7/5)*x-72 = 0
X+7/5*x-72 = 0 // - X-72
7/5*x = -(X-72) // : 7/5
x = (-(X-72))/7/5
x = 5/7*(72-X)
x = 5/7*(72-X)
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