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x in (-oo:+oo)
(x+2)/3 = (x+4)/7 // - (x+4)/7
(x+2)/3-((x+4)/7) = 0
(x+2)/3+(-1*(x+4))/7 = 0
(7*(x+2))/(3*7)+(-1*3*(x+4))/(3*7) = 0
7*(x+2)-1*3*(x+4) = 0
4*x+2 = 0
(4*x+2)/(3*7) = 0
(4*x+2)/(3*7) = 0 // * 3*7
4*x+2 = 0
4*x+2 = 0 // - 2
4*x = -2 // : 4
x = -2/4
x = -1/2
x = -1/2
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