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x in (-oo:+oo)
8-(x/4) = (6*(x+1))/9 // - (6*(x+1))/9
8-((6*(x+1))/9)-(x/4) = 0
(-2/3)*(x+1)-(x/4)+8 = 0
8-2/3*(x+1)-x/4 = 0
(-2/3*4*(x+1))/4-x/4+(4*8)/4 = 0
4*8-2/3*4*(x+1)-x = 0
32-11/3*x-8/3 = 0
88/3-11/3*x = 0
(88/3-11/3*x)/4 = 0
(88/3-11/3*x)/4 = 0 // * 4
88/3-11/3*x = 0
88/3-11/3*x = 0 // - 88/3
-11/3*x = -88/3 // : -11/3
x = -88/3/(-11/3)
x = 8
x = 8
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