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x in (-oo:+oo)
(3/4)*x = 9/18 // - 9/18
(3/4)*x-(9/18) = 0
(3/4)*x-1/2 = 0
3/4*x-1/2 = 0 // + 1/2
3/4*x = 1/2 // : 3/4
x = 1/2/3/4
x = 2/3
x = 2/3
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