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x in (-oo:+oo)
(7/12)*x = 28/3 // - 28/3
(7/12)*x-(28/3) = 0
(7/12)*x-28/3 = 0
7/12*x-28/3 = 0 // + 28/3
7/12*x = 28/3 // : 7/12
x = 28/3/7/12
x = 16
x = 16
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