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x in (-oo:+oo)
x/4-x = 3 // - 3
x/4-x-3 = 0
(1/4-1)*x-3 = 0 // + 3
(1/4-1)*x = 3 // : 1/4-1
x = 3/(1/4-1)
x = 3/(1/4-1)
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