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x in (-oo:+oo)
(3/4)*x = 7/2 // - 7/2
(3/4)*x-(7/2) = 0
(3/4)*x-7/2 = 0
3/4*x-7/2 = 0 // + 7/2
3/4*x = 7/2 // : 3/4
x = 7/2/3/4
x = 14/3
x = 14/3
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