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