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x in (-oo:+oo)
(1/2)*x+1/2 = 5-12+8 // - 5-12+8
(1/2)*x+1/2-8-5+12 = 0
1/2*x-1/2 = 0 // + 1/2
1/2*x = 1/2 // : 1/2
x = 1/2/1/2
x = 1
x = 1
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