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X in (-oo:+oo)
(2*X+9)/3+2*X+2*X+X+9 = 243 // - 243
(2*X+9)/3+2*X+2*X+X-243+9 = 0
(2*X+9)/3+(2*3*X)/3+(2*3*X)/3+(3*X)/3+(-243*3)/3+(3*9)/3 = 0
2*X+2*3*X+2*3*X+3*X-243*3+3*9+9 = 0
8*X+6*X+3*X-729+9+27 = 0
14*X+3*X-729+9+27 = 0
17*X-729+9+27 = 0
17*X-720+27 = 0
17*X-693 = 0
(17*X-693)/3 = 0
(17*X-693)/3 = 0 // * 3
17*X-693 = 0
17*X-693 = 0 // + 693
17*X = 693 // : 17
X = 693/17
X = 693/17
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