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