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x in (-oo:+oo)
(5/6)*x-(1/2) = 7 // - 7
(5/6)*x-(1/2)-7 = 0
(5/6)*x-1/2-7 = 0
5/6*x-15/2 = 0 // + 15/2
5/6*x = 15/2 // : 5/6
x = 15/2/5/6
x = 9
x = 9
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