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x in (-oo:+oo)
X/4-(x/5) = 6 // - 6
X/4-(x/5)-6 = 0
1/4*X-1/5*x-6 = 0 // - 1/4*X-6
-1/5*x = -(1/4*X-6) // : -1/5
x = (-(1/4*X-6))/(-1/5)
x = -5*(6-(1/4*X))
x = -5*(6-(1/4*X))
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