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x in (-oo:+oo)
(x-5)/7 = (x+3)/2 // - (x+3)/2
(x-5)/7-((x+3)/2) = 0
(x-5)/7+(-1*(x+3))/2 = 0
(2*(x-5))/(2*7)+(-1*7*(x+3))/(2*7) = 0
2*(x-5)-1*7*(x+3) = 0
-5*x-31 = 0
(-5*x-31)/(2*7) = 0
(-5*x-31)/(2*7) = 0 // * 2*7
-5*x-31 = 0
-5*x-31 = 0 // + 31
-5*x = 31 // : -5
x = 31/(-5)
x = -31/5
x = -31/5
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