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x in (-oo:+oo)
X-((25*x)/28) = 9 // - 9
X-((25*x)/28)-9 = 0
X+(-25/28)*x-9 = 0
X-25/28*x-9 = 0 // - X-9
-25/28*x = -(X-9) // : -25/28
x = (-(X-9))/(-25/28)
x = -28/25*(9-X)
x = -28/25*(9-X)
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