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x in (-oo:+oo)
(7/3)*x = 3/4 // - 3/4
(7/3)*x-(3/4) = 0
(7/3)*x-3/4 = 0
7/3*x-3/4 = 0 // + 3/4
7/3*x = 3/4 // : 7/3
x = 3/4/7/3
x = 9/28
x = 9/28
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