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x in (-oo:+oo)
X/5+(2*x)/15 = 8 // - 8
X/5+(2*x)/15-8 = 0
1/5*X+2/15*x-8 = 0 // - 1/5*X-8
2/15*x = -(1/5*X-8) // : 2/15
x = (-(1/5*X-8))/2/15
x = 15/2*(8-(1/5*X))
x = 15/2*(8-(1/5*X))
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