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x in (-oo:+oo)
X = 90-((7*x)/2) // - 90-((7*x)/2)
X+(7*x)/2-90 = 0
X+7/2*x-90 = 0 // - X-90
7/2*x = -(X-90) // : 7/2
x = (-(X-90))/7/2
x = 2/7*(90-X)
x = 2/7*(90-X)
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