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x in (-oo:+oo)
x/5+12 = 3*x // - 3*x
x/5-(3*x)+12 = 0
x/5-3*x+12 = 0
12-14/5*x = 0 // - 12
-14/5*x = -12 // : -14/5
x = -12/(-14/5)
x = 30/7
x = 30/7
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