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x in (-oo:+oo)
(12/5)*x = 4-x // - 4-x
(12/5)*x+x-4 = 0
17/5*x-4 = 0 // + 4
17/5*x = 4 // : 17/5
x = 4/17/5
x = 20/17
x = 20/17
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