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