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x in (-oo:+oo)
(7/12)*x = 3/14 // - 3/14
(7/12)*x-(3/14) = 0
(7/12)*x-3/14 = 0
7/12*x-3/14 = 0 // + 3/14
7/12*x = 3/14 // : 7/12
x = 3/14/7/12
x = 18/49
x = 18/49
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