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x in (-oo:+oo)
x-3 = (2*x+6)/5 // - (2*x+6)/5
x-((2*x+6)/5)-3 = 0
(-1*(2*x+6))/5+x-3 = 0
(-1*(2*x+6))/5+(5*x)/5+(-3*5)/5 = 0
5*x-1*(2*x+6)-3*5 = 0
3*x-15-6 = 0
3*x-21 = 0
(3*x-21)/5 = 0
(3*x-21)/5 = 0 // * 5
3*x-21 = 0
3*x-21 = 0 // + 21
3*x = 21 // : 3
x = 21/3
x = 7
x = 7
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