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x in (-oo:+oo)
(1/5)*x = 3*x-28 // - 3*x-28
(1/5)*x-(3*x)+28 = 0
(1/5)*x-3*x+28 = 0
28-14/5*x = 0 // - 28
-14/5*x = -28 // : -14/5
x = -28/(-14/5)
x = 10
x = 10
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