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x in (-oo:+oo)
X/4-(x/5) = 8 // - 8
X/4-(x/5)-8 = 0
1/4*X-1/5*x-8 = 0 // - 1/4*X-8
-1/5*x = -(1/4*X-8) // : -1/5
x = (-(1/4*X-8))/(-1/5)
x = -5*(8-(1/4*X))
x = -5*(8-(1/4*X))
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