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x in (-oo:+oo)
X-(8*x) = (7/9)*(81*x-18) // - (7/9)*(81*x-18)
X-((7/9)*(81*x-18))-(8*x) = 0
(-7/9)*(81*x-18)+X-8*x = 0
X-7/9*(81*x-18)-8*x = 0
X-7/9*(81*x-18)-8*x = 0
X-63*x-8*x+14 = 0
X-71*x+14 = 0
X-71*x+14 = 0
X-71*x+14 = 0 // - X+14
-71*x = -(X+14) // : -71
x = (-(X+14))/(-71)
x = (X+14)/71
x = (X+14)/71
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