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x in (-oo:+oo)
X/4-(x/9) = 5 // - 5
X/4-(x/9)-5 = 0
1/4*X-1/9*x-5 = 0 // - 1/4*X-5
-1/9*x = -(1/4*X-5) // : -1/9
x = (-(1/4*X-5))/(-1/9)
x = -9*(5-(1/4*X))
x = -9*(5-(1/4*X))
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