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x in (-oo:+oo)
(x+2)/3+(x-1)/4 = 9/2 // - 9/2
(x+2)/3+(x-1)/4-(9/2) = 0
(x+2)/3+(x-1)/4-9/2 = 0
(2*4*(x+2))/(2*3*4)+(2*3*(x-1))/(2*3*4)+(-9*3*4)/(2*3*4) = 0
2*4*(x+2)+2*3*(x-1)-9*3*4 = 0
14*x-108+10 = 0
14*x-98 = 0
(14*x-98)/(2*3*4) = 0
(14*x-98)/(2*3*4) = 0 // * 2*3*4
14*x-98 = 0
14*x-98 = 0 // + 98
14*x = 98 // : 14
x = 98/14
x = 7
x = 7
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