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x in (-oo:+oo)
(1/8)*x-3 = 3/4 // - 3/4
(1/8)*x-(3/4)-3 = 0
(1/8)*x-3/4-3 = 0
1/8*x-15/4 = 0 // + 15/4
1/8*x = 15/4 // : 1/8
x = 15/4/1/8
x = 30
x = 30
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