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x in (-oo:+oo)
(x+5)/7+(x+4)/6 = 1 // - 1
(x+5)/7+(x+4)/6-1 = 0
(6*(x+5))/(6*7)+(7*(x+4))/(6*7)+(-1*6*7)/(6*7) = 0
6*(x+5)+7*(x+4)-1*6*7 = 0
13*x-42+58 = 0
13*x+16 = 0
(13*x+16)/(6*7) = 0
(13*x+16)/(6*7) = 0 // * 6*7
13*x+16 = 0
13*x+16 = 0 // - 16
13*x = -16 // : 13
x = -16/13
x = -16/13
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