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x in (-oo:+oo)
(1/2)*x+1/4 = -2 // + 2
(1/2)*x+1/4+2 = 0
1/2*x+9/4 = 0 // - 9/4
1/2*x = -9/4 // : 1/2
x = -9/4/1/2
x = -9/2
x = -9/2
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