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x in (-oo:+oo)
(1/2)*x = 7/12 // - 7/12
(1/2)*x-(7/12) = 0
(1/2)*x-7/12 = 0
1/2*x-7/12 = 0 // + 7/12
1/2*x = 7/12 // : 1/2
x = 7/12/1/2
x = 7/6
x = 7/6
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