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x in (-oo:+oo)
(x+5)/3 = 3*x+7 // - 3*x+7
(x+5)/3-(3*x)-7 = 0
(x+5)/3-3*x-7 = 0
(x+5)/3+(-3*3*x)/3+(-7*3)/3 = 0
x-3*3*x-7*3+5 = 0
5-8*x-21 = 0
-8*x-16 = 0
(-8*x-16)/3 = 0
(-8*x-16)/3 = 0 // * 3
-8*x-16 = 0
-8*x-16 = 0 // + 16
-8*x = 16 // : -8
x = 16/(-8)
x = -2
x = -2
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