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x in (-oo:+oo)
(1/4)*x-8 = 2*x-29 // - 2*x-29
(1/4)*x-(2*x)-8+29 = 0
(1/4)*x-2*x-8+29 = 0
21-7/4*x = 0 // - 21
-7/4*x = -21 // : -7/4
x = -21/(-7/4)
x = 12
x = 12
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