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x in (-oo:+oo)
2*x+1/8 = -3 // + 3
2*x+1/8+3 = 0
2*x+25/8 = 0 // - 25/8
2*x = -25/8 // : 2
x = -25/8/2
x = -25/16
x = -25/16
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