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x in (-oo:+oo)
(3/4)*x-17 = 12 // - 12
(3/4)*x-17-12 = 0
3/4*x-29 = 0 // + 29
3/4*x = 29 // : 3/4
x = 29/3/4
x = 116/3
x = 116/3
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