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x in (-oo:+oo)
(2/8)*x-(2/3) = 7/12 // - 7/12
(2/8)*x-(2/3)-(7/12) = 0
(2/8)*x-2/3-7/12 = 0
1/4*x-5/4 = 0 // + 5/4
1/4*x = 5/4 // : 1/4
x = 5/4/1/4
x = 5
x = 5
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