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x in (-oo:+oo)
X/9+4*x = 8 // - 8
X/9+4*x-8 = 0
1/9*X+4*x-8 = 0 // - 1/9*X-8
4*x = -(1/9*X-8) // : 4
x = (-(1/9*X-8))/4
x = (8-(1/9*X))/4
x = (8-(1/9*X))/4
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