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x in (-oo:+oo)
(3/4)*x = 3-x // - 3-x
(3/4)*x+x-3 = 0
7/4*x-3 = 0 // + 3
7/4*x = 3 // : 7/4
x = 3/7/4
x = 12/7
x = 12/7
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