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x in (-oo:+oo)
x/2 = 3*(x-5) // - 3*(x-5)
x/2-(3*(x-5)) = 0
x/2-3*(x-5) = 0
(-3*2*(x-5))/2+x/2 = 0
x-3*2*(x-5) = 0
30-5*x = 0
(30-5*x)/2 = 0
(30-5*x)/2 = 0 // * 2
30-5*x = 0
30-5*x = 0 // - 30
-5*x = -30 // : -5
x = -30/(-5)
x = 6
x = 6
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