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X in (-oo:+oo)
2*(X+1) = (2/3)*X+9 // - (2/3)*X+9
2*(X+1)-((2/3)*X)-9 = 0
2*(X+1)+(-2/3)*X-9 = 0
2*(X+1)+(-2*X)/3-9 = 0
(2*3*(X+1))/3+(-2*X)/3+(-9*3)/3 = 0
2*3*(X+1)-2*X-9*3 = 0
4*X-27+6 = 0
4*X-21 = 0
(4*X-21)/3 = 0
(4*X-21)/3 = 0 // * 3
4*X-21 = 0
4*X-21 = 0 // + 21
4*X = 21 // : 4
X = 21/4
X = 21/4
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