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x in (-oo:+oo)
(3*x)/3-((x-2)/2) = (x+5)/7 // - (x+5)/7
(3*x)/3-((x-2)/2)-((x+5)/7) = 0
(-1*(x-2))/2+(-1*(x+5))/7+x = 0
(-1*7*(x-2))/(2*7)+(-1*2*(x+5))/(2*7)+(2*7*x)/(2*7) = 0
2*7*x-1*7*(x-2)-1*2*(x+5) = 0
14*x-9*x+4 = 0
5*x+4 = 0
(5*x+4)/(2*7) = 0
(5*x+4)/(2*7) = 0 // * 2*7
5*x+4 = 0
5*x+4 = 0 // - 4
5*x = -4 // : 5
x = -4/5
x = -4/5
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