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x in (-oo:+oo)
(1/4)*x+1/8 = 21/8 // - 21/8
(1/4)*x+1/8-(21/8) = 0
(1/4)*x+1/8-21/8 = 0
1/4*x-5/2 = 0 // + 5/2
1/4*x = 5/2 // : 1/4
x = 5/2/1/4
x = 10
x = 10
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