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x in (-oo:+oo)
(3/4)*x = 6/1 // - 6/1
(3/4)*x-(6/1) = 0
(3/4)*x-6 = 0
3/4*x-6 = 0 // + 6
3/4*x = 6 // : 3/4
x = 6/3/4
x = 8
x = 8
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