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x in (-oo:+oo)
x/3 = (x+2)/7 // - (x+2)/7
x/3-((x+2)/7) = 0
(-1*(x+2))/7+x/3 = 0
(-1*3*(x+2))/(3*7)+(7*x)/(3*7) = 0
7*x-1*3*(x+2) = 0
4*x-6 = 0
(4*x-6)/(3*7) = 0
(4*x-6)/(3*7) = 0 // * 3*7
4*x-6 = 0
4*x-6 = 0 // + 6
4*x = 6 // : 4
x = 6/4
x = 3/2
x = 3/2
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